diff --git a/doc/source/write_tests.rst b/doc/source/write_tests.rst
index 2363fa6..4e3bfa2 100644
--- a/doc/source/write_tests.rst
+++ b/doc/source/write_tests.rst
@@ -178,16 +178,16 @@
 +-------------------+---------------------+
 | Credentials Entry | Manager Variable    |
 +===================+=====================+
-| primary           | cls.os              |
+| primary           | cls.os_primary      |
 +-------------------+---------------------+
-| admin             | cls.os_adm          |
+| admin             | cls.os_admin        |
 +-------------------+---------------------+
 | alt               | cls.os_alt          |
 +-------------------+---------------------+
 | [$label, $role]   | cls.os_roles_$label |
 +-------------------+---------------------+
 
-By default cls.os is available since it is allocated in the base tempest test
+By default cls.os_primary is available since it is allocated in the base tempest test
 class (located in tempest/test.py). If your TestCase inherits from a different
 direct parent class (it'll still inherit from the BaseTestCase, just not
 directly) be sure to check if that class overrides allocated credentials.
@@ -270,13 +270,13 @@
 
   class TestExampleCase(test.BaseTestCase):
     def test_example_create_server(self):
-      self.os.servers_client.create_server(...)
+      self.os_primary.servers_client.create_server(...)
 
-is all you need to do. As described previously, in the above example the ``self.os``
-is created automatically because the base test class sets the ``credentials``
-attribute to allocate a primary credential set and initializes the client
-manager as ``self.os``. This same access pattern can be used for all of the
-clients in Tempest.
+is all you need to do. As described previously, in the above example the
+``self.os_primary`` is created automatically because the base test class sets the
+``credentials`` attribute to allocate a primary credential set and initializes
+the client manager as ``self.os_primary``. This same access pattern can be used
+for all of the clients in Tempest.
 
 Credentials Objects
 -------------------
@@ -293,7 +293,7 @@
 
   class TestExampleCase(test.BaseTestCase):
     def test_example_create_server(self):
-      credentials = self.os.credentials
+      credentials = self.os_primary.credentials
 
 The credentials object provides access to all of the credential information you
 would need to make API requests. For example, building off the previous
@@ -304,7 +304,7 @@
 
   class TestExampleCase(test.BaseTestCase):
     def test_example_create_server(self):
-      credentials = self.os.credentials
+      credentials = self.os_primary.credentials
       username = credentials.username
       user_id = credentials.user_id
       password = credentials.password
diff --git a/tempest/api/compute/admin/test_auto_allocate_network.py b/tempest/api/compute/admin/test_auto_allocate_network.py
index c4db5e3..ba8a214 100644
--- a/tempest/api/compute/admin/test_auto_allocate_network.py
+++ b/tempest/api/compute/admin/test_auto_allocate_network.py
@@ -151,7 +151,7 @@
         """Tests that no networking is allocated for the server."""
         # create the server with no networking
         server, _ = compute.create_test_server(
-            self.os, networks='none', wait_until='ACTIVE')
+            self.os_primary, networks='none', wait_until='ACTIVE')
         self.addCleanup(self.delete_server, server['id'])
         # get the server ips
         addresses = self.servers_client.list_addresses(
@@ -176,7 +176,7 @@
         # - Third request sees net1 and net2 for the tenant and fails with a
         #   NetworkAmbiguous 400 error.
         _, servers = compute.create_test_server(
-            self.os, networks='auto', wait_until='ACTIVE',
+            self.os_primary, networks='auto', wait_until='ACTIVE',
             min_count=3)
         server_nets = set()
         for server in servers:
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 141b9f3..d893446 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -204,7 +204,7 @@
             kwargs['name'] = data_utils.rand_name(cls.__name__ + "-server")
         tenant_network = cls.get_tenant_network()
         body, servers = compute.create_test_server(
-            cls.os,
+            cls.os_primary,
             validatable,
             validation_resources=cls.validation_resources,
             tenant_network=tenant_network,
@@ -350,7 +350,7 @@
     @classmethod
     def delete_volume(cls, volume_id):
         """Deletes the given volume and waits for it to be gone."""
-        cls._delete_volume(cls.volumes_extensions_client, volume_id)
+        cls._delete_volume(cls.volumes_client, volume_id)
 
     @classmethod
     def get_server_ip(cls, server):
diff --git a/tempest/api/compute/servers/test_attach_interfaces.py b/tempest/api/compute/servers/test_attach_interfaces.py
index e50b29a..6c5cc79 100644
--- a/tempest/api/compute/servers/test_attach_interfaces.py
+++ b/tempest/api/compute/servers/test_attach_interfaces.py
@@ -264,7 +264,8 @@
 
         # create two servers
         _, servers = compute.create_test_server(
-            self.os, tenant_network=network, wait_until='ACTIVE', min_count=2)
+            self.os_primary, tenant_network=network,
+            wait_until='ACTIVE', min_count=2)
         # add our cleanups for the servers since we bypassed the base class
         for server in servers:
             self.addCleanup(self.delete_server, server['id'])
diff --git a/tempest/api/compute/servers/test_multiple_create.py b/tempest/api/compute/servers/test_multiple_create.py
index 7cbb513..059454d 100644
--- a/tempest/api/compute/servers/test_multiple_create.py
+++ b/tempest/api/compute/servers/test_multiple_create.py
@@ -24,7 +24,7 @@
     def test_multiple_create(self):
         tenant_network = self.get_tenant_network()
         body, servers = compute.create_test_server(
-            self.os,
+            self.os_primary,
             wait_until='ACTIVE',
             min_count=2,
             tenant_network=tenant_network)
diff --git a/tempest/api/compute/servers/test_servers.py b/tempest/api/compute/servers/test_servers.py
index 11f236b..ea4c141 100644
--- a/tempest/api/compute/servers/test_servers.py
+++ b/tempest/api/compute/servers/test_servers.py
@@ -102,14 +102,10 @@
         prefix_name = u'\u00CD\u00F1st\u00E1\u00F1c\u00E9'
         self._update_server_name(server['id'], 'ACTIVE', prefix_name)
 
-    @decorators.idempotent_id('6ac19cb1-27a3-40ec-b350-810bdc04c08e')
-    def test_update_server_name_in_stop_state(self):
-        # The server name should be changed to the provided value
-        server = self.create_test_server(wait_until='ACTIVE')
+        # stop server and check server name update again
         self.client.stop_server(server['id'])
         waiters.wait_for_server_status(self.client, server['id'], 'SHUTOFF')
         # Update instance name with non-ASCII characters
-        prefix_name = u'\u00CD\u00F1st\u00E1\u00F1c\u00E9'
         updated_server = self._update_server_name(server['id'],
                                                   'SHUTOFF',
                                                   prefix_name)
diff --git a/tempest/api/compute/volumes/test_volume_snapshots.py b/tempest/api/compute/volumes/test_volume_snapshots.py
index 2f3a06e..0f436eb 100644
--- a/tempest/api/compute/volumes/test_volume_snapshots.py
+++ b/tempest/api/compute/volumes/test_volume_snapshots.py
@@ -27,6 +27,11 @@
 
 class VolumesSnapshotsTestJSON(base.BaseV2ComputeTest):
 
+    # These tests will fail with a 404 starting from microversion 2.36. For
+    # more information, see:
+    # https://developer.openstack.org/api-ref/compute/#volume-extension-os-volumes-os-snapshots-deprecated
+    max_microversion = '2.35'
+
     @classmethod
     def skip_checks(cls):
         super(VolumesSnapshotsTestJSON, cls).skip_checks()
diff --git a/tempest/api/compute/volumes/test_volumes_get.py b/tempest/api/compute/volumes/test_volumes_get.py
index 43c837a..d9ee5b1 100644
--- a/tempest/api/compute/volumes/test_volumes_get.py
+++ b/tempest/api/compute/volumes/test_volumes_get.py
@@ -27,6 +27,11 @@
 
 class VolumesGetTestJSON(base.BaseV2ComputeTest):
 
+    # These tests will fail with a 404 starting from microversion 2.36. For
+    # more information, see:
+    # https://developer.openstack.org/api-ref/compute/#volume-extension-os-volumes-os-snapshots-deprecated
+    max_microversion = '2.35'
+
     @classmethod
     def skip_checks(cls):
         super(VolumesGetTestJSON, cls).skip_checks()
diff --git a/tempest/api/compute/volumes/test_volumes_list.py b/tempest/api/compute/volumes/test_volumes_list.py
index 0d8214f..b2aebe7 100644
--- a/tempest/api/compute/volumes/test_volumes_list.py
+++ b/tempest/api/compute/volumes/test_volumes_list.py
@@ -27,6 +27,11 @@
     # If you are running a Devstack environment, ensure that the
     # VOLUME_BACKING_FILE_SIZE is at least 4G in your localrc
 
+    # These tests will fail with a 404 starting from microversion 2.36. For
+    # more information, see:
+    # https://developer.openstack.org/api-ref/compute/#volume-extension-os-volumes-os-snapshots-deprecated
+    max_microversion = '2.35'
+
     @classmethod
     def skip_checks(cls):
         super(VolumesTestJSON, cls).skip_checks()
diff --git a/tempest/api/compute/volumes/test_volumes_negative.py b/tempest/api/compute/volumes/test_volumes_negative.py
index 80db1be..87f7d8a 100644
--- a/tempest/api/compute/volumes/test_volumes_negative.py
+++ b/tempest/api/compute/volumes/test_volumes_negative.py
@@ -24,6 +24,11 @@
 
 class VolumesNegativeTest(base.BaseV2ComputeTest):
 
+    # These tests will fail with a 404 starting from microversion 2.36. For
+    # more information, see:
+    # https://developer.openstack.org/api-ref/compute/#volume-extension-os-volumes-os-snapshots-deprecated
+    max_microversion = '2.35'
+
     @classmethod
     def skip_checks(cls):
         super(VolumesNegativeTest, cls).skip_checks()
diff --git a/tempest/api/network/admin/test_routers.py b/tempest/api/network/admin/test_routers.py
new file mode 100644
index 0000000..ec8d260
--- /dev/null
+++ b/tempest/api/network/admin/test_routers.py
@@ -0,0 +1,231 @@
+# Copyright 2013 OpenStack Foundation
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import testtools
+
+from tempest.api.network import base
+from tempest import config
+from tempest.lib.common.utils import data_utils
+from tempest.lib import decorators
+from tempest import test
+
+CONF = config.CONF
+
+
+class RoutersAdminTest(base.BaseAdminNetworkTest):
+    # NOTE(salv-orlando): This class inherits from BaseAdminNetworkTest
+    # as some router operations, such as enabling or disabling SNAT
+    # require admin credentials by default
+
+    def _cleanup_router(self, router):
+        self.delete_router(router)
+        self.routers.remove(router)
+
+    def _create_router(self, name=None, admin_state_up=False,
+                       external_network_id=None, enable_snat=None):
+        # associate a cleanup with created routers to avoid quota limits
+        router = self.create_router(name, admin_state_up,
+                                    external_network_id, enable_snat)
+        self.addCleanup(self._cleanup_router, router)
+        return router
+
+    def _add_router_interface_with_subnet_id(self, router_id, subnet_id):
+        interface = self.routers_client.add_router_interface(
+            router_id, subnet_id=subnet_id)
+        self.addCleanup(self._remove_router_interface_with_subnet_id,
+                        router_id, subnet_id)
+        self.assertEqual(subnet_id, interface['subnet_id'])
+        return interface
+
+    def _remove_router_interface_with_subnet_id(self, router_id, subnet_id):
+        body = self.routers_client.remove_router_interface(router_id,
+                                                           subnet_id=subnet_id)
+        self.assertEqual(subnet_id, body['subnet_id'])
+
+    @classmethod
+    def skip_checks(cls):
+        super(RoutersAdminTest, cls).skip_checks()
+        if not test.is_extension_enabled('router', 'network'):
+            msg = "router extension not enabled."
+            raise cls.skipException(msg)
+
+    @classmethod
+    def resource_setup(cls):
+        super(RoutersAdminTest, cls).resource_setup()
+        cls.tenant_cidr = (CONF.network.project_network_cidr
+                           if cls._ip_version == 4 else
+                           CONF.network.project_network_v6_cidr)
+
+    @decorators.idempotent_id('e54dd3a3-4352-4921-b09d-44369ae17397')
+    def test_create_router_setting_project_id(self):
+        # Test creating router from admin user setting project_id.
+        project = data_utils.rand_name('test_tenant_')
+        description = data_utils.rand_name('desc_')
+        project = self.identity_utils.create_project(name=project,
+                                                     description=description)
+        project_id = project['id']
+        self.addCleanup(self.identity_utils.delete_project, project_id)
+
+        name = data_utils.rand_name('router-')
+        create_body = self.admin_routers_client.create_router(
+            name=name, tenant_id=project_id)
+        self.addCleanup(self.admin_routers_client.delete_router,
+                        create_body['router']['id'])
+        self.assertEqual(project_id, create_body['router']['tenant_id'])
+
+    @decorators.idempotent_id('847257cc-6afd-4154-b8fb-af49f5670ce8')
+    @test.requires_ext(extension='ext-gw-mode', service='network')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_create_router_with_default_snat_value(self):
+        # Create a router with default snat rule
+        router = self._create_router(
+            external_network_id=CONF.network.public_network_id)
+        self._verify_router_gateway(
+            router['id'], {'network_id': CONF.network.public_network_id,
+                           'enable_snat': True})
+
+    @decorators.idempotent_id('ea74068d-09e9-4fd7-8995-9b6a1ace920f')
+    @test.requires_ext(extension='ext-gw-mode', service='network')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_create_router_with_snat_explicit(self):
+        name = data_utils.rand_name('snat-router')
+        # Create a router enabling snat attributes
+        enable_snat_states = [False, True]
+        for enable_snat in enable_snat_states:
+            external_gateway_info = {
+                'network_id': CONF.network.public_network_id,
+                'enable_snat': enable_snat}
+            create_body = self.admin_routers_client.create_router(
+                name=name, external_gateway_info=external_gateway_info)
+            self.addCleanup(self.admin_routers_client.delete_router,
+                            create_body['router']['id'])
+            # Verify snat attributes after router creation
+            self._verify_router_gateway(create_body['router']['id'],
+                                        exp_ext_gw_info=external_gateway_info)
+
+    def _verify_router_gateway(self, router_id, exp_ext_gw_info=None):
+        show_body = self.admin_routers_client.show_router(router_id)
+        actual_ext_gw_info = show_body['router']['external_gateway_info']
+        if exp_ext_gw_info is None:
+            self.assertIsNone(actual_ext_gw_info)
+            return
+        # Verify only keys passed in exp_ext_gw_info
+        for k, v in exp_ext_gw_info.items():
+            self.assertEqual(v, actual_ext_gw_info[k])
+
+    def _verify_gateway_port(self, router_id):
+        list_body = self.admin_ports_client.list_ports(
+            network_id=CONF.network.public_network_id,
+            device_id=router_id)
+        self.assertEqual(len(list_body['ports']), 1)
+        gw_port = list_body['ports'][0]
+        fixed_ips = gw_port['fixed_ips']
+        self.assertGreaterEqual(len(fixed_ips), 1)
+        # Assert that all of the IPs from the router gateway port
+        # are allocated from a valid public subnet.
+        public_net_body = self.admin_networks_client.show_network(
+            CONF.network.public_network_id)
+        public_subnet_ids = public_net_body['network']['subnets']
+        for fixed_ip in fixed_ips:
+            subnet_id = fixed_ip['subnet_id']
+            self.assertIn(subnet_id, public_subnet_ids)
+
+    @decorators.idempotent_id('6cc285d8-46bf-4f36-9b1a-783e3008ba79')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_update_router_set_gateway(self):
+        router = self._create_router()
+        self.routers_client.update_router(
+            router['id'],
+            external_gateway_info={
+                'network_id': CONF.network.public_network_id})
+        # Verify operation - router
+        self._verify_router_gateway(
+            router['id'],
+            {'network_id': CONF.network.public_network_id})
+        self._verify_gateway_port(router['id'])
+
+    @decorators.idempotent_id('b386c111-3b21-466d-880c-5e72b01e1a33')
+    @test.requires_ext(extension='ext-gw-mode', service='network')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_update_router_set_gateway_with_snat_explicit(self):
+        router = self._create_router()
+        self.admin_routers_client.update_router(
+            router['id'],
+            external_gateway_info={
+                'network_id': CONF.network.public_network_id,
+                'enable_snat': True})
+        self._verify_router_gateway(
+            router['id'],
+            {'network_id': CONF.network.public_network_id,
+             'enable_snat': True})
+        self._verify_gateway_port(router['id'])
+
+    @decorators.idempotent_id('96536bc7-8262-4fb2-9967-5c46940fa279')
+    @test.requires_ext(extension='ext-gw-mode', service='network')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_update_router_set_gateway_without_snat(self):
+        router = self._create_router()
+        self.admin_routers_client.update_router(
+            router['id'],
+            external_gateway_info={
+                'network_id': CONF.network.public_network_id,
+                'enable_snat': False})
+        self._verify_router_gateway(
+            router['id'],
+            {'network_id': CONF.network.public_network_id,
+             'enable_snat': False})
+        self._verify_gateway_port(router['id'])
+
+    @decorators.idempotent_id('ad81b7ee-4f81-407b-a19c-17e623f763e8')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_update_router_unset_gateway(self):
+        router = self._create_router(
+            external_network_id=CONF.network.public_network_id)
+        self.routers_client.update_router(router['id'],
+                                          external_gateway_info={})
+        self._verify_router_gateway(router['id'])
+        # No gateway port expected
+        list_body = self.admin_ports_client.list_ports(
+            network_id=CONF.network.public_network_id,
+            device_id=router['id'])
+        self.assertFalse(list_body['ports'])
+
+    @decorators.idempotent_id('f2faf994-97f4-410b-a831-9bc977b64374')
+    @test.requires_ext(extension='ext-gw-mode', service='network')
+    @testtools.skipUnless(CONF.network.public_network_id,
+                          'The public_network_id option must be specified.')
+    def test_update_router_reset_gateway_without_snat(self):
+        router = self._create_router(
+            external_network_id=CONF.network.public_network_id)
+        self.admin_routers_client.update_router(
+            router['id'],
+            external_gateway_info={
+                'network_id': CONF.network.public_network_id,
+                'enable_snat': False})
+        self._verify_router_gateway(
+            router['id'],
+            {'network_id': CONF.network.public_network_id,
+             'enable_snat': False})
+        self._verify_gateway_port(router['id'])
+
+
+class RoutersIpV6AdminTest(RoutersAdminTest):
+    _ip_version = 6
diff --git a/tempest/api/network/test_routers.py b/tempest/api/network/test_routers.py
index 0466d3a..d78cd1e 100644
--- a/tempest/api/network/test_routers.py
+++ b/tempest/api/network/test_routers.py
@@ -25,10 +25,7 @@
 CONF = config.CONF
 
 
-class RoutersTest(base.BaseAdminNetworkTest):
-    # NOTE(salv-orlando): This class inherits from BaseAdminNetworkTest
-    # as some router operations, such as enabling or disabling SNAT
-    # require admin credentials by default
+class RoutersTest(base.BaseNetworkTest):
 
     def _cleanup_router(self, router):
         self.delete_router(router)
@@ -101,55 +98,6 @@
             router['id'])['router']
         self.assertEqual(router_show['name'], updated_name)
 
-    @decorators.idempotent_id('e54dd3a3-4352-4921-b09d-44369ae17397')
-    def test_create_router_setting_project_id(self):
-        # Test creating router from admin user setting project_id.
-        project = data_utils.rand_name('test_tenant_')
-        description = data_utils.rand_name('desc_')
-        project = self.identity_utils.create_project(name=project,
-                                                     description=description)
-        project_id = project['id']
-        self.addCleanup(self.identity_utils.delete_project, project_id)
-
-        name = data_utils.rand_name('router-')
-        create_body = self.admin_routers_client.create_router(
-            name=name, tenant_id=project_id)
-        self.addCleanup(self.admin_routers_client.delete_router,
-                        create_body['router']['id'])
-        self.assertEqual(project_id, create_body['router']['tenant_id'])
-
-    @decorators.idempotent_id('847257cc-6afd-4154-b8fb-af49f5670ce8')
-    @test.requires_ext(extension='ext-gw-mode', service='network')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_create_router_with_default_snat_value(self):
-        # Create a router with default snat rule
-        router = self._create_router(
-            external_network_id=CONF.network.public_network_id)
-        self._verify_router_gateway(
-            router['id'], {'network_id': CONF.network.public_network_id,
-                           'enable_snat': True})
-
-    @decorators.idempotent_id('ea74068d-09e9-4fd7-8995-9b6a1ace920f')
-    @test.requires_ext(extension='ext-gw-mode', service='network')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_create_router_with_snat_explicit(self):
-        name = data_utils.rand_name('snat-router')
-        # Create a router enabling snat attributes
-        enable_snat_states = [False, True]
-        for enable_snat in enable_snat_states:
-            external_gateway_info = {
-                'network_id': CONF.network.public_network_id,
-                'enable_snat': enable_snat}
-            create_body = self.admin_routers_client.create_router(
-                name=name, external_gateway_info=external_gateway_info)
-            self.addCleanup(self.admin_routers_client.delete_router,
-                            create_body['router']['id'])
-            # Verify snat attributes after router creation
-            self._verify_router_gateway(create_body['router']['id'],
-                                        exp_ext_gw_info=external_gateway_info)
-
     @decorators.attr(type='smoke')
     @decorators.idempotent_id('b42e6e39-2e37-49cc-a6f4-8467e940900a')
     def test_add_remove_router_interface_with_subnet_id(self):
@@ -218,55 +166,6 @@
             subnet_id = fixed_ip['subnet_id']
             self.assertIn(subnet_id, public_subnet_ids)
 
-    @decorators.idempotent_id('6cc285d8-46bf-4f36-9b1a-783e3008ba79')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_update_router_set_gateway(self):
-        router = self._create_router()
-        self.routers_client.update_router(
-            router['id'],
-            external_gateway_info={
-                'network_id': CONF.network.public_network_id})
-        # Verify operation - router
-        self._verify_router_gateway(
-            router['id'],
-            {'network_id': CONF.network.public_network_id})
-        self._verify_gateway_port(router['id'])
-
-    @decorators.idempotent_id('b386c111-3b21-466d-880c-5e72b01e1a33')
-    @test.requires_ext(extension='ext-gw-mode', service='network')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_update_router_set_gateway_with_snat_explicit(self):
-        router = self._create_router()
-        self.admin_routers_client.update_router(
-            router['id'],
-            external_gateway_info={
-                'network_id': CONF.network.public_network_id,
-                'enable_snat': True})
-        self._verify_router_gateway(
-            router['id'],
-            {'network_id': CONF.network.public_network_id,
-             'enable_snat': True})
-        self._verify_gateway_port(router['id'])
-
-    @decorators.idempotent_id('96536bc7-8262-4fb2-9967-5c46940fa279')
-    @test.requires_ext(extension='ext-gw-mode', service='network')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_update_router_set_gateway_without_snat(self):
-        router = self._create_router()
-        self.admin_routers_client.update_router(
-            router['id'],
-            external_gateway_info={
-                'network_id': CONF.network.public_network_id,
-                'enable_snat': False})
-        self._verify_router_gateway(
-            router['id'],
-            {'network_id': CONF.network.public_network_id,
-             'enable_snat': False})
-        self._verify_gateway_port(router['id'])
-
     @decorators.idempotent_id('cbe42f84-04c2-11e7-8adb-fa163e4fa634')
     @test.requires_ext(extension='ext-gw-mode', service='network')
     @testtools.skipUnless(CONF.network.public_network_id,
@@ -298,39 +197,6 @@
                          'external_fixed_ips'][0]['ip_address'],
                          fixed_ip['ip_address'])
 
-    @decorators.idempotent_id('ad81b7ee-4f81-407b-a19c-17e623f763e8')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_update_router_unset_gateway(self):
-        router = self._create_router(
-            external_network_id=CONF.network.public_network_id)
-        self.routers_client.update_router(router['id'],
-                                          external_gateway_info={})
-        self._verify_router_gateway(router['id'])
-        # No gateway port expected
-        list_body = self.admin_ports_client.list_ports(
-            network_id=CONF.network.public_network_id,
-            device_id=router['id'])
-        self.assertFalse(list_body['ports'])
-
-    @decorators.idempotent_id('f2faf994-97f4-410b-a831-9bc977b64374')
-    @test.requires_ext(extension='ext-gw-mode', service='network')
-    @testtools.skipUnless(CONF.network.public_network_id,
-                          'The public_network_id option must be specified.')
-    def test_update_router_reset_gateway_without_snat(self):
-        router = self._create_router(
-            external_network_id=CONF.network.public_network_id)
-        self.admin_routers_client.update_router(
-            router['id'],
-            external_gateway_info={
-                'network_id': CONF.network.public_network_id,
-                'enable_snat': False})
-        self._verify_router_gateway(
-            router['id'],
-            {'network_id': CONF.network.public_network_id,
-             'enable_snat': False})
-        self._verify_gateway_port(router['id'])
-
     @decorators.idempotent_id('c86ac3a8-50bd-4b00-a6b8-62af84a0765c')
     @test.requires_ext(extension='extraroute', service='network')
     def test_update_delete_extra_route(self):
diff --git a/tempest/api/volume/base.py b/tempest/api/volume/base.py
index 3f33c7b..eace92d 100644
--- a/tempest/api/volume/base.py
+++ b/tempest/api/volume/base.py
@@ -224,7 +224,7 @@
 
         tenant_network = self.get_tenant_network()
         body, _ = compute.create_test_server(
-            self.os,
+            self.os_primary,
             tenant_network=tenant_network,
             name=name,
             **kwargs)
diff --git a/tempest/scenario/test_security_groups_basic_ops.py b/tempest/scenario/test_security_groups_basic_ops.py
index 2116fe8..c25ce4c 100644
--- a/tempest/scenario/test_security_groups_basic_ops.py
+++ b/tempest/scenario/test_security_groups_basic_ops.py
@@ -168,7 +168,7 @@
 
         cls.floating_ips = {}
         cls.tenants = {}
-        cls.primary_tenant = cls.TenantProperties(cls.os)
+        cls.primary_tenant = cls.TenantProperties(cls.os_primary)
         cls.alt_tenant = cls.TenantProperties(cls.os_alt)
         for tenant in [cls.primary_tenant, cls.alt_tenant]:
             cls.tenants[tenant.creds.tenant_id] = tenant
diff --git a/tempest/tests/cmd/test_verify_tempest_config.py b/tempest/tests/cmd/test_verify_tempest_config.py
index 98bf145..640dcd4 100644
--- a/tempest/tests/cmd/test_verify_tempest_config.py
+++ b/tempest/tests/cmd/test_verify_tempest_config.py
@@ -12,9 +12,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import fixtures
 import mock
 from oslo_serialization import jsonutils as json
-from oslotest import mockpatch
 
 from tempest.cmd import verify_tempest_config
 from tempest import config
@@ -73,12 +73,12 @@
                          fake_config.FakePrivate)
 
     def test_get_keystone_api_versions(self):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': {'values': [{'id': 'v2.0'}, {'id': 'v3.0'}]}}
         fake_resp = json.dumps(fake_resp)
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.lib.common.http.ClosingHttp.request',
             return_value=(None, fake_resp)))
         fake_os = mock.MagicMock()
@@ -87,12 +87,12 @@
         self.assertIn('v3.0', versions)
 
     def test_get_cinder_api_versions(self):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': [{'id': 'v1.0'}, {'id': 'v2.0'}]}
         fake_resp = json.dumps(fake_resp)
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.lib.common.http.ClosingHttp.request',
             return_value=(None, fake_resp)))
         fake_os = mock.MagicMock()
@@ -101,12 +101,12 @@
         self.assertIn('v2.0', versions)
 
     def test_get_nova_versions(self):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': [{'id': 'v2.0'}, {'id': 'v3.0'}]}
         fake_resp = json.dumps(fake_resp)
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.lib.common.http.ClosingHttp.request',
             return_value=(None, fake_resp)))
         fake_os = mock.MagicMock()
@@ -117,17 +117,17 @@
     def test_get_versions_invalid_response(self):
         # When the response doesn't contain a JSON response, an error is
         # logged.
-        mock_log_error = self.useFixture(mockpatch.PatchObject(
+        mock_log_error = self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config.LOG, 'error')).mock
 
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint'))
 
         # Simulated response is not JSON.
         sample_body = (
             '<html><head>Sample Response</head><body>This is the sample page '
             'for the web server. Why are you requesting it?</body></html>')
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.lib.common.http.ClosingHttp.request',
             return_value=(None, sample_body)))
 
@@ -157,7 +157,7 @@
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_keystone_api_versions_no_v3(self, mock_request):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': {'values': [{'id': 'v2.0'}]}}
@@ -173,7 +173,7 @@
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_keystone_api_versions_no_v2(self, mock_request):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': {'values': [{'id': 'v3.0'}]}}
@@ -189,7 +189,7 @@
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_cinder_api_versions_no_v3(self, mock_request):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': [{'id': 'v2.0'}]}
@@ -203,7 +203,7 @@
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_cinder_api_versions_no_v2(self, mock_request):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': [{'id': 'v3.0'}]}
@@ -221,7 +221,7 @@
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_cinder_api_versions_no_v1(self, mock_request):
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
         fake_resp = {'versions': [{'id': 'v2.0'}, {'id': 'v3.0'}]}
@@ -276,7 +276,7 @@
         fake_os = mock.MagicMock()
         fake_os.network_extensions_client.list_extensions = (
             fake_list_extensions)
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['fake1', 'fake2', 'fake3'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -299,7 +299,7 @@
         fake_os = mock.MagicMock()
         fake_os.network_extensions_client.list_extensions = (
             fake_list_extensions)
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['all'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -319,7 +319,7 @@
         fake_os.volumes_extension_client.list_extensions = fake_list_extensions
         fake_os.volumes_v2_extension_client.list_extensions = (
             fake_list_extensions)
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['fake1', 'fake2', 'fake3'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -344,7 +344,7 @@
         fake_os.volumes_extension_client.list_extensions = fake_list_extensions
         fake_os.volumes_v2_extension_client.list_extensions = (
             fake_list_extensions)
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['all'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -360,7 +360,7 @@
                      {'alias': 'not_fake'}])
         fake_os = mock.MagicMock()
         fake_os.extensions_client.list_extensions = fake_list_extensions
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['fake1', 'fake2', 'fake3'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -382,7 +382,7 @@
                                     {'alias': 'not_fake'}]})
         fake_os = mock.MagicMock()
         fake_os.extensions_client.list_extensions = fake_list_extensions
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['all'])))
         results = verify_tempest_config.verify_extensions(fake_os,
@@ -400,7 +400,7 @@
                            'swift': 'metadata'})
         fake_os = mock.MagicMock()
         fake_os.capabilities_client.list_capabilities = fake_list_extensions
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['fake1', 'fake2', 'fake3'])))
         results = verify_tempest_config.verify_extensions(fake_os, 'swift', {})
@@ -422,7 +422,7 @@
                            'swift': 'metadata'})
         fake_os = mock.MagicMock()
         fake_os.capabilities_client.list_capabilities = fake_list_extensions
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             verify_tempest_config, 'get_enabled_extensions',
             return_value=(['all'])))
         results = verify_tempest_config.verify_extensions(fake_os,
diff --git a/tempest/tests/common/test_admin_available.py b/tempest/tests/common/test_admin_available.py
index 01a9cd0..c3d248c 100644
--- a/tempest/tests/common/test_admin_available.py
+++ b/tempest/tests/common/test_admin_available.py
@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import fixtures
 from oslo_config import cfg
-from oslotest import mockpatch
 
 from tempest.common import credentials_factory as credentials
 from tempest import config
@@ -52,16 +52,16 @@
                                  'project_name': 'admin',
                                  'password': 'p',
                                  'types': ['admin']})
-            self.useFixture(mockpatch.Patch(
+            self.useFixture(fixtures.MockPatch(
                 'tempest.common.preprov_creds.read_accounts_yaml',
                 return_value=accounts))
             cfg.CONF.set_default('test_accounts_file',
                                  use_accounts_file, group='auth')
-            self.useFixture(mockpatch.Patch('os.path.isfile',
-                                            return_value=True))
+            self.useFixture(fixtures.MockPatch('os.path.isfile',
+                                               return_value=True))
         else:
-            self.useFixture(mockpatch.Patch('os.path.isfile',
-                                            return_value=False))
+            self.useFixture(fixtures.MockPatch('os.path.isfile',
+                                               return_value=False))
             if admin_creds:
                 username = 'u'
                 project = 't'
diff --git a/tempest/tests/common/test_alt_available.py b/tempest/tests/common/test_alt_available.py
index 27db95c..b9a8967 100644
--- a/tempest/tests/common/test_alt_available.py
+++ b/tempest/tests/common/test_alt_available.py
@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import fixtures
 from oslo_config import cfg
-from oslotest import mockpatch
 
 from tempest.common import credentials_factory as credentials
 from tempest import config
@@ -39,16 +39,16 @@
             accounts = [dict(username="u%s" % ii,
                              project_name="t%s" % ii,
                              password="p") for ii in creds]
-            self.useFixture(mockpatch.Patch(
+            self.useFixture(fixtures.MockPatch(
                 'tempest.common.preprov_creds.read_accounts_yaml',
                 return_value=accounts))
             cfg.CONF.set_default('test_accounts_file',
                                  use_accounts_file, group='auth')
-            self.useFixture(mockpatch.Patch('os.path.isfile',
-                                            return_value=True))
+            self.useFixture(fixtures.MockPatch('os.path.isfile',
+                                               return_value=True))
         else:
-            self.useFixture(mockpatch.Patch('os.path.isfile',
-                                            return_value=False))
+            self.useFixture(fixtures.MockPatch('os.path.isfile',
+                                               return_value=False))
         expected = len(set(creds)) > 1 or dynamic_creds
         observed = credentials.is_alt_available(
             identity_version=self.identity_version)
diff --git a/tempest/tests/common/test_dynamic_creds.py b/tempest/tests/common/test_dynamic_creds.py
index b4fbd50..c739619 100644
--- a/tempest/tests/common/test_dynamic_creds.py
+++ b/tempest/tests/common/test_dynamic_creds.py
@@ -12,9 +12,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import fixtures
 import mock
 from oslo_config import cfg
-from oslotest import mockpatch
 
 from tempest.common import credentials_factory as credentials
 from tempest.common import dynamic_creds
@@ -84,7 +84,7 @@
             tenant_name='fake_tenant')
 
     def _mock_user_create(self, id, name):
-        user_fix = self.useFixture(mockpatch.PatchObject(
+        user_fix = self.useFixture(fixtures.MockPatchObject(
             self.users_client.UsersClient,
             'create_user',
             return_value=(rest_client.ResponseBody
@@ -92,7 +92,7 @@
         return user_fix
 
     def _mock_tenant_create(self, id, name):
-        tenant_fix = self.useFixture(mockpatch.PatchObject(
+        tenant_fix = self.useFixture(fixtures.MockPatchObject(
             self.tenants_client.TenantsClient,
             'create_tenant',
             return_value=(rest_client.ResponseBody
@@ -100,7 +100,7 @@
         return tenant_fix
 
     def _mock_list_roles(self, id, name):
-        roles_fix = self.useFixture(mockpatch.PatchObject(
+        roles_fix = self.useFixture(fixtures.MockPatchObject(
             self.roles_client.RolesClient,
             'list_roles',
             return_value=(rest_client.ResponseBody
@@ -111,7 +111,7 @@
         return roles_fix
 
     def _mock_list_2_roles(self):
-        roles_fix = self.useFixture(mockpatch.PatchObject(
+        roles_fix = self.useFixture(fixtures.MockPatchObject(
             self.roles_client.RolesClient,
             'list_roles',
             return_value=(rest_client.ResponseBody
@@ -122,7 +122,7 @@
         return roles_fix
 
     def _mock_assign_user_role(self):
-        tenant_fix = self.useFixture(mockpatch.PatchObject(
+        tenant_fix = self.useFixture(fixtures.MockPatchObject(
             self.roles_client.RolesClient,
             'create_user_role_on_project',
             return_value=(rest_client.ResponseBody
@@ -130,7 +130,7 @@
         return tenant_fix
 
     def _mock_list_role(self):
-        roles_fix = self.useFixture(mockpatch.PatchObject(
+        roles_fix = self.useFixture(fixtures.MockPatchObject(
             self.roles_client.RolesClient,
             'list_roles',
             return_value=(rest_client.ResponseBody
@@ -140,7 +140,7 @@
         return roles_fix
 
     def _mock_list_ec2_credentials(self, user_id, tenant_id):
-        ec2_creds_fix = self.useFixture(mockpatch.PatchObject(
+        ec2_creds_fix = self.useFixture(fixtures.MockPatchObject(
             self.users_client.UsersClient,
             'list_user_ec2_credentials',
             return_value=(rest_client.ResponseBody
@@ -153,21 +153,21 @@
         return ec2_creds_fix
 
     def _mock_network_create(self, iso_creds, id, name):
-        net_fix = self.useFixture(mockpatch.PatchObject(
+        net_fix = self.useFixture(fixtures.MockPatchObject(
             iso_creds.networks_admin_client,
             'create_network',
             return_value={'network': {'id': id, 'name': name}}))
         return net_fix
 
     def _mock_subnet_create(self, iso_creds, id, name):
-        subnet_fix = self.useFixture(mockpatch.PatchObject(
+        subnet_fix = self.useFixture(fixtures.MockPatchObject(
             iso_creds.subnets_admin_client,
             'create_subnet',
             return_value={'subnet': {'id': id, 'name': name}}))
         return subnet_fix
 
     def _mock_router_create(self, id, name):
-        router_fix = self.useFixture(mockpatch.PatchObject(
+        router_fix = self.useFixture(fixtures.MockPatchObject(
             routers_client.RoutersClient,
             'create_router',
             return_value={'router': {'id': id, 'name': name}}))
@@ -634,7 +634,7 @@
     def setUp(self):
         super(TestDynamicCredentialProviderV3, self).setUp()
         self.useFixture(fake_config.ConfigFixture())
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             domains_client.DomainsClient, 'list_domains',
             return_value=dict(domains=[dict(id='default',
                                             name='Default')])))
@@ -645,7 +645,7 @@
         pass
 
     def _mock_tenant_create(self, id, name):
-        project_fix = self.useFixture(mockpatch.PatchObject(
+        project_fix = self.useFixture(fixtures.MockPatchObject(
             self.tenants_client.ProjectsClient,
             'create_project',
             return_value=(rest_client.ResponseBody
diff --git a/tempest/tests/common/test_preprov_creds.py b/tempest/tests/common/test_preprov_creds.py
index 2fd375d..414b106 100644
--- a/tempest/tests/common/test_preprov_creds.py
+++ b/tempest/tests/common/test_preprov_creds.py
@@ -20,9 +20,9 @@
 import six
 import testtools
 
+import fixtures
 from oslo_concurrency.fixture import lockutils as lockutils_fixtures
 from oslo_config import cfg
-from oslotest import mockpatch
 
 from tempest.common import preprov_creds
 from tempest import config
@@ -86,10 +86,11 @@
         self.patch(self.token_client, side_effect=self.identity_response)
         self.useFixture(lockutils_fixtures.ExternalLockFixture())
         self.test_accounts = self._fake_accounts(cfg.CONF.identity.admin_role)
-        self.accounts_mock = self.useFixture(mockpatch.Patch(
+        self.accounts_mock = self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=self.test_accounts))
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=True))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=True))
 
     def tearDown(self):
         super(TestPreProvisionedCredentials, self).tearDown()
@@ -138,7 +139,8 @@
 
     def test_create_hash_file_previous_file(self):
         # Emulate the lock existing on the filesystem
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=True))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=True))
         with mock.patch('six.moves.builtins.open', mock.mock_open(),
                         create=True):
             test_account_class = (
@@ -150,7 +152,8 @@
 
     def test_create_hash_file_no_previous_file(self):
         # Emulate the lock not existing on the filesystem
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=False))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=False))
         with mock.patch('six.moves.builtins.open', mock.mock_open(),
                         create=True):
             test_account_class = (
@@ -163,10 +166,12 @@
     @mock.patch('oslo_concurrency.lockutils.lock')
     def test_get_free_hash_no_previous_accounts(self, lock_mock):
         # Emulate no pre-existing lock
-        self.useFixture(mockpatch.Patch('os.path.isdir', return_value=False))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isdir', return_value=False))
         hash_list = self._get_hash_list(self.test_accounts)
-        mkdir_mock = self.useFixture(mockpatch.Patch('os.mkdir'))
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=False))
+        mkdir_mock = self.useFixture(fixtures.MockPatch('os.mkdir'))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=False))
         test_account_class = preprov_creds.PreProvisionedCredentialProvider(
             **self.fixed_params)
         with mock.patch('six.moves.builtins.open', mock.mock_open(),
@@ -182,9 +187,10 @@
     def test_get_free_hash_no_free_accounts(self, lock_mock):
         hash_list = self._get_hash_list(self.test_accounts)
         # Emulate pre-existing lock dir
-        self.useFixture(mockpatch.Patch('os.path.isdir', return_value=True))
-        # Emulate all lcoks in list are in use
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=True))
+        self.useFixture(fixtures.MockPatch('os.path.isdir', return_value=True))
+        # Emulate all locks in list are in use
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=True))
         test_account_class = preprov_creds.PreProvisionedCredentialProvider(
             **self.fixed_params)
         with mock.patch('six.moves.builtins.open', mock.mock_open(),
@@ -195,7 +201,7 @@
     @mock.patch('oslo_concurrency.lockutils.lock')
     def test_get_free_hash_some_in_use_accounts(self, lock_mock):
         # Emulate no pre-existing lock
-        self.useFixture(mockpatch.Patch('os.path.isdir', return_value=True))
+        self.useFixture(fixtures.MockPatch('os.path.isdir', return_value=True))
         hash_list = self._get_hash_list(self.test_accounts)
         test_account_class = preprov_creds.PreProvisionedCredentialProvider(
             **self.fixed_params)
@@ -219,13 +225,14 @@
     def test_remove_hash_last_account(self, lock_mock):
         hash_list = self._get_hash_list(self.test_accounts)
         # Pretend the pseudo-lock is there
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=True))
+        self.useFixture(
+            fixtures.MockPatch('os.path.isfile', return_value=True))
         # Pretend the lock dir is empty
-        self.useFixture(mockpatch.Patch('os.listdir', return_value=[]))
+        self.useFixture(fixtures.MockPatch('os.listdir', return_value=[]))
         test_account_class = preprov_creds.PreProvisionedCredentialProvider(
             **self.fixed_params)
-        remove_mock = self.useFixture(mockpatch.Patch('os.remove'))
-        rmdir_mock = self.useFixture(mockpatch.Patch('os.rmdir'))
+        remove_mock = self.useFixture(fixtures.MockPatch('os.remove'))
+        rmdir_mock = self.useFixture(fixtures.MockPatch('os.rmdir'))
         test_account_class.remove_hash(hash_list[2])
         hash_path = os.path.join(self.fixed_params['accounts_lock_dir'],
                                  hash_list[2])
@@ -237,14 +244,15 @@
     def test_remove_hash_not_last_account(self, lock_mock):
         hash_list = self._get_hash_list(self.test_accounts)
         # Pretend the pseudo-lock is there
-        self.useFixture(mockpatch.Patch('os.path.isfile', return_value=True))
+        self.useFixture(fixtures.MockPatch(
+            'os.path.isfile', return_value=True))
         # Pretend the lock dir is empty
-        self.useFixture(mockpatch.Patch('os.listdir', return_value=[
+        self.useFixture(fixtures.MockPatch('os.listdir', return_value=[
             hash_list[1], hash_list[4]]))
         test_account_class = preprov_creds.PreProvisionedCredentialProvider(
             **self.fixed_params)
-        remove_mock = self.useFixture(mockpatch.Patch('os.remove'))
-        rmdir_mock = self.useFixture(mockpatch.Patch('os.rmdir'))
+        remove_mock = self.useFixture(fixtures.MockPatch('os.remove'))
+        rmdir_mock = self.useFixture(fixtures.MockPatch('os.rmdir'))
         test_account_class.remove_hash(hash_list[2])
         hash_path = os.path.join(self.fixed_params['accounts_lock_dir'],
                                  hash_list[2])
@@ -258,7 +266,7 @@
 
     def test_is_not_multi_user(self):
         self.test_accounts = [self.test_accounts[0]]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=self.test_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -270,7 +278,7 @@
             **self.fixed_params)
         hashes = test_accounts_class.hash_dict['roles']['role4']
         temp_hash = hashes[0]
-        get_free_hash_mock = self.useFixture(mockpatch.PatchObject(
+        get_free_hash_mock = self.useFixture(fixtures.MockPatchObject(
             test_accounts_class, '_get_free_hash', return_value=temp_hash))
         # Test a single role returns all matching roles
         test_accounts_class._get_creds(roles=['role4'])
@@ -287,7 +295,7 @@
         hashes2 = test_accounts_class.hash_dict['roles']['role2']
         hashes = list(set(hashes) & set(hashes2))
         temp_hash = hashes[0]
-        get_free_hash_mock = self.useFixture(mockpatch.PatchObject(
+        get_free_hash_mock = self.useFixture(fixtures.MockPatchObject(
             test_accounts_class, '_get_free_hash', return_value=temp_hash))
         # Test an intersection of multiple roles
         test_accounts_class._get_creds(roles=['role2', 'role4'])
@@ -304,7 +312,7 @@
         admin_hashes = test_accounts_class.hash_dict['roles'][
             cfg.CONF.identity.admin_role]
         temp_hash = hashes[0]
-        get_free_hash_mock = self.useFixture(mockpatch.PatchObject(
+        get_free_hash_mock = self.useFixture(fixtures.MockPatchObject(
             test_accounts_class, '_get_free_hash', return_value=temp_hash))
         # Test an intersection of multiple roles
         test_accounts_class._get_creds()
@@ -322,7 +330,7 @@
             {'username': 'test_user14', 'tenant_name': 'test_tenant14',
              'password': 'p', 'roles': ['role-7', 'role-11'],
              'resources': {'network': 'network-2'}}]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=test_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -350,7 +358,7 @@
     def test_get_primary_creds_none_available(self):
         admin_accounts = [x for x in self.test_accounts if 'test_admin'
                           in x['username']]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=admin_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -368,7 +376,7 @@
     def test_get_alt_creds_none_available(self):
         admin_accounts = [x for x in self.test_accounts if 'test_admin'
                           in x['username']]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=admin_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -389,7 +397,7 @@
              'password': 'p', 'roles': ['role1', 'role2', 'role3', 'role4']},
             {'username': 'test_admin1', 'tenant_name': 'test_tenant11',
              'password': 'p', 'types': ['admin']}]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=test_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -403,7 +411,7 @@
              'password': 'p', 'roles': ['role1', 'role2', 'role3', 'role4']},
             {'username': 'test_admin1', 'tenant_name': 'test_tenant11',
              'password': 'p', 'roles': [cfg.CONF.identity.admin_role]}]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=test_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
@@ -414,7 +422,7 @@
     def test_get_admin_creds_none_available(self):
         non_admin_accounts = [x for x in self.test_accounts if 'test_admin'
                               not in x['username']]
-        self.useFixture(mockpatch.Patch(
+        self.useFixture(fixtures.MockPatch(
             'tempest.common.preprov_creds.read_accounts_yaml',
             return_value=non_admin_accounts))
         test_accounts_class = preprov_creds.PreProvisionedCredentialProvider(
diff --git a/tempest/tests/common/utils/linux/test_remote_client.py b/tempest/tests/common/utils/linux/test_remote_client.py
index ecb8e64..739357b 100644
--- a/tempest/tests/common/utils/linux/test_remote_client.py
+++ b/tempest/tests/common/utils/linux/test_remote_client.py
@@ -16,7 +16,6 @@
 
 import fixtures
 from oslo_config import cfg
-from oslotest import mockpatch
 
 from tempest.common.utils.linux import remote_client
 from tempest import config
@@ -64,8 +63,8 @@
         cfg.CONF.set_default('connect_timeout', 1, group='validation')
 
         self.conn = remote_client.RemoteClient('127.0.0.1', 'user', 'pass')
-        self.ssh_mock = self.useFixture(mockpatch.PatchObject(self.conn,
-                                                              'ssh_client'))
+        self.ssh_mock = self.useFixture(fixtures.MockPatchObject(self.conn,
+                                                                 'ssh_client'))
 
     def test_write_to_console_regular_str(self):
         self.conn.write_to_console('test')
@@ -111,7 +110,7 @@
         booted_at = 10000
         uptime_sec = 5000.02
         self.ssh_mock.mock.exec_command.return_value = uptime_sec
-        self.useFixture(mockpatch.PatchObject(
+        self.useFixture(fixtures.MockPatchObject(
             time, 'time', return_value=booted_at + uptime_sec))
         self.assertEqual(self.conn.get_boot_time(),
                          time.localtime(booted_at))
diff --git a/tempest/tests/lib/test_auth.py b/tempest/tests/lib/test_auth.py
index ac13a13..c3a792f 100644
--- a/tempest/tests/lib/test_auth.py
+++ b/tempest/tests/lib/test_auth.py
@@ -16,7 +16,7 @@
 import copy
 import datetime
 
-from oslotest import mockpatch
+import fixtures
 import testtools
 
 from tempest.lib import auth
@@ -82,9 +82,9 @@
 
     def test_auth_data_property_when_cache_exists(self):
         self.auth_provider.cache = 'foo'
-        self.useFixture(mockpatch.PatchObject(self.auth_provider,
-                                              'is_expired',
-                                              return_value=False))
+        self.useFixture(fixtures.MockPatchObject(self.auth_provider,
+                                                 'is_expired',
+                                                 return_value=False))
         self.assertEqual('foo', getattr(self.auth_provider, 'auth_data'))
 
     def test_delete_auth_data_property_through_deleter(self):
diff --git a/tempest/tests/lib/test_rest_client.py b/tempest/tests/lib/test_rest_client.py
index 43bb6d0..ace2b80 100644
--- a/tempest/tests/lib/test_rest_client.py
+++ b/tempest/tests/lib/test_rest_client.py
@@ -15,8 +15,8 @@
 import copy
 import json
 
+import fixtures
 import jsonschema
-from oslotest import mockpatch
 import six
 
 from tempest.lib.common import http
@@ -38,16 +38,16 @@
         self.rest_client = rest_client.RestClient(
             self.fake_auth_provider, None, None)
         self.patchobject(http.ClosingHttp, 'request', self.fake_http.request)
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              '_log_request'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 '_log_request'))
 
 
 class TestRestClientHTTPMethods(BaseRestClientTestClass):
     def setUp(self):
         self.fake_http = fake_http.fake_httplib2()
         super(TestRestClientHTTPMethods, self).setUp()
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              '_error_checker'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 '_error_checker'))
 
     def test_post(self):
         __, return_dict = self.rest_client.post(self.url, {}, {})
@@ -70,8 +70,8 @@
         self.assertEqual('PUT', return_dict['method'])
 
     def test_head(self):
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              'response_checker'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 'response_checker'))
         __, return_dict = self.rest_client.head(self.url)
         self.assertEqual('HEAD', return_dict['method'])
 
@@ -122,8 +122,8 @@
         self._verify_headers(resp)
 
     def test_head(self):
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              'response_checker'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 'response_checker'))
         resp, __ = self.rest_client.head(self.url)
         self._verify_headers(resp)
 
@@ -136,8 +136,8 @@
     def setUp(self):
         self.fake_http = fake_http.fake_httplib2()
         super(TestRestClientUpdateHeaders, self).setUp()
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              '_error_checker'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 '_error_checker'))
         self.headers = {'X-Configuration-Session': 'session_id'}
 
     def test_post_update_headers(self):
@@ -201,8 +201,8 @@
         )
 
     def test_head_update_headers(self):
-        self.useFixture(mockpatch.PatchObject(self.rest_client,
-                                              'response_checker'))
+        self.useFixture(fixtures.MockPatchObject(self.rest_client,
+                                                 'response_checker'))
 
         __, return_dict = self.rest_client.head(self.url,
                                                 extra_headers=True,
@@ -1145,8 +1145,8 @@
     }
 
     def test_current_json_schema_validator_version(self):
-        with mockpatch.PatchObject(jsonschema.Draft4Validator,
-                                   "check_schema") as chk_schema:
+        with fixtures.MockPatchObject(jsonschema.Draft4Validator,
+                                      "check_schema") as chk_schema:
             body = {'foo': 'test'}
             self._test_validate_pass(self.schema, body)
             chk_schema.mock.assert_called_once_with(
diff --git a/tempest/tests/test_decorators.py b/tempest/tests/test_decorators.py
index 8b6472b..2fc84dc 100644
--- a/tempest/tests/test_decorators.py
+++ b/tempest/tests/test_decorators.py
@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import fixtures
 from oslo_config import cfg
-from oslotest import mockpatch
 import testtools
 
 from tempest import config
@@ -95,8 +95,8 @@
                           'bad_service')
 
     def test_services_decorator_with_service_valid_and_unavailable(self):
-        self.useFixture(mockpatch.PatchObject(test.CONF.service_available,
-                                              'cinder', False))
+        self.useFixture(fixtures.MockPatchObject(test.CONF.service_available,
+                                                 'cinder', False))
         self.assertRaises(testtools.TestCase.skipException,
                           self._test_services_helper, 'compute',
                           'volume')