diff --git a/doc/source/plugin.rst b/doc/source/plugin.rst
index 77ef9ed..2afb1e5 100644
--- a/doc/source/plugin.rst
+++ b/doc/source/plugin.rst
@@ -29,6 +29,8 @@
 * tempest.config
 * tempest.test_discover.plugins
 * tempest.common.credentials_factory
+* tempest.clients
+* tempest.test
 
 If there is an interface from tempest that you need to rely on in your plugin
 which is not listed above, it likely needs to be migrated to tempest.lib. In
diff --git a/releasenotes/notes/intermediate-queens-release-2f9f305775fca454.yaml b/releasenotes/notes/intermediate-queens-release-2f9f305775fca454.yaml
new file mode 100644
index 0000000..1493b0b
--- /dev/null
+++ b/releasenotes/notes/intermediate-queens-release-2f9f305775fca454.yaml
@@ -0,0 +1,4 @@
+---
+prelude: >
+    This is an intermediate release during the Queens development cycle to
+    make new functionality available to plugins and other consumers.
diff --git a/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml b/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml
new file mode 100644
index 0000000..609000c
--- /dev/null
+++ b/releasenotes/notes/remove-get-ipv6-addr-by-EUI64-c79972d799c7a430.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Remove deprecated get_ipv6_addr_by_EUI64 method from data_utils.
+    Use the same method from oslo_utils.netutils.
diff --git a/releasenotes/notes/test-clients-stable-for-plugin-90b1e7dc83f28ccd.yaml b/releasenotes/notes/test-clients-stable-for-plugin-90b1e7dc83f28ccd.yaml
new file mode 100644
index 0000000..e27ee33
--- /dev/null
+++ b/releasenotes/notes/test-clients-stable-for-plugin-90b1e7dc83f28ccd.yaml
@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Two extra modules are now marked as stable for plugins, test.py and clients.py.
+    The former includes the test base class with its automatic credentials
+    provisioning and test resource managing fixtures.
+    The latter is built on top of ServiceClients and it adds aliases and a few custom
+    configurations to it.
diff --git a/tempest/api/compute/floating_ips/base.py b/tempest/api/compute/floating_ips/base.py
index 142eaec..262a3c1 100644
--- a/tempest/api/compute/floating_ips/base.py
+++ b/tempest/api/compute/floating_ips/base.py
@@ -14,6 +14,10 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest.common import utils
+from tempest import config
+
+CONF = config.CONF
 
 
 class BaseFloatingIPsTest(base.BaseV2ComputeTest):
@@ -24,3 +28,17 @@
         cls.set_network_resources(network=True, subnet=True,
                                   router=True, dhcp=True)
         super(BaseFloatingIPsTest, cls).setup_credentials()
+
+    @classmethod
+    def skip_checks(cls):
+        super(BaseFloatingIPsTest, cls).skip_checks()
+        if not utils.get_service_list()['network']:
+            raise cls.skipException("network service not enabled.")
+        if not CONF.network_feature_enabled.floating_ips:
+            raise cls.skipException("Floating ips are not available")
+
+    @classmethod
+    def setup_clients(cls):
+        super(BaseFloatingIPsTest, cls).setup_clients()
+        cls.client = cls.floating_ips_client
+        cls.pools_client = cls.floating_ip_pools_client
diff --git a/tempest/api/compute/floating_ips/test_floating_ips_actions.py b/tempest/api/compute/floating_ips/test_floating_ips_actions.py
index 8938570..2adc482 100644
--- a/tempest/api/compute/floating_ips/test_floating_ips_actions.py
+++ b/tempest/api/compute/floating_ips/test_floating_ips_actions.py
@@ -16,7 +16,6 @@
 import testtools
 
 from tempest.api.compute.floating_ips import base
-from tempest.common import utils
 from tempest import config
 from tempest.lib.common.utils import test_utils
 from tempest.lib import decorators
@@ -27,32 +26,7 @@
 
 class FloatingIPsTestJSON(base.BaseFloatingIPsTest):
 
-    @classmethod
-    def skip_checks(cls):
-        super(FloatingIPsTestJSON, cls).skip_checks()
-        if not utils.get_service_list()['network']:
-            raise cls.skipException("network service not enabled.")
-        if not CONF.network_feature_enabled.floating_ips:
-            raise cls.skipException("Floating ips are not available")
-
-    @classmethod
-    def setup_clients(cls):
-        super(FloatingIPsTestJSON, cls).setup_clients()
-        cls.client = cls.floating_ips_client
-
-    @classmethod
-    def resource_setup(cls):
-        super(FloatingIPsTestJSON, cls).resource_setup()
-
-        # Server creation
-        server = cls.create_test_server(wait_until='ACTIVE')
-        cls.server_id = server['id']
-        # Floating IP creation
-        body = cls.client.create_floating_ip(
-            pool=CONF.network.floating_network_name)['floating_ip']
-        cls.addClassResourceCleanup(cls.client.delete_floating_ip, body['id'])
-        cls.floating_ip_id = body['id']
-        cls.floating_ip = body['ip']
+    max_microversion = '2.35'
 
     @decorators.idempotent_id('f7bfb946-297e-41b8-9e8c-aba8e9bb5194')
     def test_allocate_floating_ip(self):
@@ -83,6 +57,25 @@
         # Check it was really deleted.
         self.client.wait_for_resource_deletion(floating_ip_body['id'])
 
+
+class FloatingIPsAssociationTestJSON(base.BaseFloatingIPsTest):
+
+    max_microversion = '2.43'
+
+    @classmethod
+    def resource_setup(cls):
+        super(FloatingIPsAssociationTestJSON, cls).resource_setup()
+
+        # Server creation
+        cls.server = cls.create_test_server(wait_until='ACTIVE')
+        cls.server_id = cls.server['id']
+        # Floating IP creation
+        body = cls.client.create_floating_ip(
+            pool=CONF.network.floating_network_name)['floating_ip']
+        cls.addClassResourceCleanup(cls.client.delete_floating_ip, body['id'])
+        cls.floating_ip_id = body['id']
+        cls.floating_ip = body['ip']
+
     @decorators.idempotent_id('307efa27-dc6f-48a0-8cd2-162ce3ef0b52')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
diff --git a/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py b/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
index c3d7816..9257458 100644
--- a/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
+++ b/tempest/api/compute/floating_ips/test_floating_ips_actions_negative.py
@@ -16,7 +16,6 @@
 import testtools
 
 from tempest.api.compute.floating_ips import base
-from tempest.common import utils
 from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
@@ -27,26 +26,12 @@
 
 class FloatingIPsNegativeTestJSON(base.BaseFloatingIPsTest):
 
-    @classmethod
-    def skip_checks(cls):
-        super(FloatingIPsNegativeTestJSON, cls).skip_checks()
-        if not utils.get_service_list()['network']:
-            raise cls.skipException("network service not enabled.")
-        if not CONF.network_feature_enabled.floating_ips:
-            raise cls.skipException("Floating ips are not available")
-
-    @classmethod
-    def setup_clients(cls):
-        super(FloatingIPsNegativeTestJSON, cls).setup_clients()
-        cls.client = cls.floating_ips_client
+    max_microversion = '2.35'
 
     @classmethod
     def resource_setup(cls):
         super(FloatingIPsNegativeTestJSON, cls).resource_setup()
 
-        # Server creation
-        server = cls.create_test_server(wait_until='ACTIVE')
-        cls.server_id = server['id']
         # Generating a nonexistent floatingIP id
         body = cls.client.list_floating_ips()['floating_ips']
         floating_ip_ids = [floating_ip['id'] for floating_ip in body]
@@ -77,6 +62,17 @@
         self.assertRaises(lib_exc.NotFound, self.client.delete_floating_ip,
                           self.non_exist_id)
 
+
+class FloatingIPsAssociationNegativeTestJSON(base.BaseFloatingIPsTest):
+
+    max_microversion = '2.43'
+
+    @classmethod
+    def resource_setup(cls):
+        super(FloatingIPsAssociationNegativeTestJSON, cls).resource_setup()
+        cls.server = cls.create_test_server(wait_until='ACTIVE')
+        cls.server_id = cls.server['id']
+
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('595fa616-1a71-4670-9614-46564ac49a4c')
     def test_associate_nonexistent_floating_ip(self):
diff --git a/tempest/api/compute/floating_ips/test_list_floating_ips.py b/tempest/api/compute/floating_ips/test_list_floating_ips.py
index 516c544..944f798 100644
--- a/tempest/api/compute/floating_ips/test_list_floating_ips.py
+++ b/tempest/api/compute/floating_ips/test_list_floating_ips.py
@@ -13,29 +13,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.api.compute import base
-from tempest.common import utils
+from tempest.api.compute.floating_ips import base
 from tempest import config
 from tempest.lib import decorators
 
 CONF = config.CONF
 
 
-class FloatingIPDetailsTestJSON(base.BaseV2ComputeTest):
+class FloatingIPDetailsTestJSON(base.BaseFloatingIPsTest):
 
-    @classmethod
-    def skip_checks(cls):
-        super(FloatingIPDetailsTestJSON, cls).skip_checks()
-        if not utils.get_service_list()['network']:
-            raise cls.skipException("network service not enabled.")
-        if not CONF.network_feature_enabled.floating_ips:
-            raise cls.skipException("Floating ips are not available")
-
-    @classmethod
-    def setup_clients(cls):
-        super(FloatingIPDetailsTestJSON, cls).setup_clients()
-        cls.client = cls.floating_ips_client
-        cls.pools_client = cls.floating_ip_pools_client
+    max_microversion = '2.35'
 
     @classmethod
     def resource_setup(cls):
diff --git a/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py b/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
index 0ade872..d69248c 100644
--- a/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
+++ b/tempest/api/compute/floating_ips/test_list_floating_ips_negative.py
@@ -13,8 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.api.compute import base
-from tempest.common import utils
+from tempest.api.compute.floating_ips import base
 from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib import decorators
@@ -23,20 +22,9 @@
 CONF = config.CONF
 
 
-class FloatingIPDetailsNegativeTestJSON(base.BaseV2ComputeTest):
+class FloatingIPDetailsNegativeTestJSON(base.BaseFloatingIPsTest):
 
-    @classmethod
-    def skip_checks(cls):
-        super(FloatingIPDetailsNegativeTestJSON, cls).skip_checks()
-        if not utils.get_service_list()['network']:
-            raise cls.skipException("network service not enabled.")
-        if not CONF.network_feature_enabled.floating_ips:
-            raise cls.skipException("Floating ips are not available")
-
-    @classmethod
-    def setup_clients(cls):
-        super(FloatingIPDetailsNegativeTestJSON, cls).setup_clients()
-        cls.client = cls.floating_ips_client
+    max_microversion = '2.35'
 
     @decorators.attr(type=['negative'])
     @decorators.idempotent_id('7ab18834-4a4b-4f28-a2c5-440579866695')
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs.py b/tempest/api/volume/admin/test_volume_types_extra_specs.py
index b5a2fb7..730acdf 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs.py
@@ -46,14 +46,32 @@
             self.volume_type['id'], extra_specs)['extra_specs']
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly created")
+
+        # Only update an extra spec
         spec_key = "spec2"
         extra_spec = {spec_key: "val2"}
         body = self.admin_volume_types_client.update_volume_type_extra_specs(
             self.volume_type['id'], spec_key, extra_spec)
         self.assertIn(spec_key, body)
+        self.assertEqual(extra_spec[spec_key], body[spec_key])
+        body = self.admin_volume_types_client.show_volume_type_extra_specs(
+            self.volume_type['id'], spec_key)
+        self.assertIn(spec_key, body)
         self.assertEqual(extra_spec[spec_key], body[spec_key],
                          "Volume type extra spec incorrectly updated")
 
+        # Update an existing extra spec and create a new extra spec
+        extra_specs = {spec_key: "val3", "spec4": "val4"}
+        body = self.admin_volume_types_client.create_volume_type_extra_specs(
+            self.volume_type['id'], extra_specs)['extra_specs']
+        self.assertEqual(extra_specs, body)
+        body = self.admin_volume_types_client.list_volume_types_extra_specs(
+            self.volume_type['id'])['extra_specs']
+        for key in extra_specs:
+            self.assertIn(key, body)
+            self.assertEqual(extra_specs[key], body[key],
+                             "Volume type extra spec incorrectly created")
+
     @decorators.idempotent_id('d4772798-601f-408a-b2a5-29e8a59d1220')
     def test_volume_type_extra_spec_create_get_delete(self):
         # Create/Get/Delete volume type extra spec.
diff --git a/tempest/lib/common/utils/data_utils.py b/tempest/lib/common/utils/data_utils.py
index a0941ef..c5df590 100644
--- a/tempest/lib/common/utils/data_utils.py
+++ b/tempest/lib/common/utils/data_utils.py
@@ -18,9 +18,6 @@
 import string
 import uuid
 
-from debtcollector import removals
-import netaddr
-from oslo_utils import netutils
 from oslo_utils import uuidutils
 import six.moves
 
@@ -177,36 +174,6 @@
                     for i in range(size)])
 
 
-@removals.remove(
-    message="use get_ipv6_addr_by_EUI64 from oslo_utils.netutils",
-    version="Newton",
-    removal_version="Ocata")
-def get_ipv6_addr_by_EUI64(cidr, mac):
-    """Generate a IPv6 addr by EUI-64 with CIDR and MAC
-
-    :param str cidr: a IPv6 CIDR
-    :param str mac: a MAC address
-    :return: an IPv6 Address
-    :rtype: netaddr.IPAddress
-    """
-    # Check if the prefix is IPv4 address
-    is_ipv4 = netutils.is_valid_ipv4(cidr)
-    if is_ipv4:
-        msg = "Unable to generate IP address by EUI64 for IPv4 prefix"
-        raise TypeError(msg)
-    try:
-        eui64 = int(netaddr.EUI(mac).eui64())
-        prefix = netaddr.IPNetwork(cidr)
-        return netaddr.IPAddress(prefix.first + eui64 ^ (1 << 57))
-    except (ValueError, netaddr.AddrFormatError):
-        raise TypeError('Bad prefix or mac format for generating IPv6 '
-                        'address by EUI-64: %(prefix)s, %(mac)s:'
-                        % {'prefix': cidr, 'mac': mac})
-    except TypeError:
-        raise TypeError('Bad prefix type for generate IPv6 address by '
-                        'EUI-64: %s' % cidr)
-
-
 # Courtesy of http://stackoverflow.com/a/312464
 def chunkify(sequence, chunksize):
     """Yield successive chunks from `sequence`."""
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 2d8935e..c34eddb 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -859,11 +859,11 @@
         LOG.info("FloatingIP: {fp} is at status: {st}"
                  .format(fp=floating_ip, st=status))
 
-    def _check_tenant_network_connectivity(self, server,
-                                           username,
-                                           private_key,
-                                           should_connect=True,
-                                           servers_for_debug=None):
+    def check_tenant_network_connectivity(self, server,
+                                          username,
+                                          private_key,
+                                          should_connect=True,
+                                          servers_for_debug=None):
         if not CONF.network.project_networks_reachable:
             msg = 'Tenant networks not configured to be reachable.'
             LOG.info(msg)
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index 340c3c9..7c404ad 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -83,7 +83,7 @@
                                     should_connect=True):
         username = CONF.validation.image_ssh_user
         private_key = keypair['private_key']
-        self._check_tenant_network_connectivity(
+        self.check_tenant_network_connectivity(
             server, username, private_key,
             should_connect=should_connect,
             servers_for_debug=[server])
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 1c4e262..8937104 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -117,7 +117,12 @@
             self.ports.append({'port': port_id})
 
         server = self._create_server(self.network, port_id)
-        self._check_tenant_network_connectivity()
+        ssh_login = CONF.validation.image_ssh_user
+        for server in self.servers:
+            # call the common method in the parent class
+            self.check_tenant_network_connectivity(
+                server, ssh_login, self._get_server_key(server),
+                servers_for_debug=self.servers)
 
         floating_ip = self.create_floating_ip(server)
         self.floating_ip_tuple = Floating_IP_tuple(floating_ip, server)
@@ -170,15 +175,6 @@
     def _get_server_key(self, server):
         return self.keypairs[server['key_name']]['private_key']
 
-    def _check_tenant_network_connectivity(self):
-        ssh_login = CONF.validation.image_ssh_user
-        for server in self.servers:
-            # call the common method in the parent class
-            super(TestNetworkBasicOps, self).\
-                _check_tenant_network_connectivity(
-                    server, ssh_login, self._get_server_key(server),
-                    servers_for_debug=self.servers)
-
     def check_public_network_connectivity(
             self, should_connect=True, msg=None,
             should_check_floating_ip_status=True, mtu=None):
diff --git a/tempest/tests/lib/common/utils/test_data_utils.py b/tempest/tests/lib/common/utils/test_data_utils.py
index 8bdf70e..ab7fa74 100644
--- a/tempest/tests/lib/common/utils/test_data_utils.py
+++ b/tempest/tests/lib/common/utils/test_data_utils.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import netaddr
-
 from tempest.lib.common.utils import data_utils
 from tempest.tests import base
 
@@ -137,43 +135,6 @@
         actual = data_utils.random_bytes(size=2048)
         self.assertEqual(2048, len(actual))
 
-    def test_get_ipv6_addr_by_EUI64(self):
-        actual = data_utils.get_ipv6_addr_by_EUI64('2001:db8::',
-                                                   '00:16:3e:33:44:55')
-        self.assertIsInstance(actual, netaddr.IPAddress)
-        self.assertEqual(actual,
-                         netaddr.IPAddress('2001:db8::216:3eff:fe33:4455'))
-
-    def test_get_ipv6_addr_by_EUI64_with_IPv4_prefix(self):
-        ipv4_prefix = '10.0.8'
-        mac = '00:16:3e:33:44:55'
-        self.assertRaises(TypeError, data_utils.get_ipv6_addr_by_EUI64,
-                          ipv4_prefix, mac)
-
-    def test_get_ipv6_addr_by_EUI64_bad_cidr_type(self):
-        bad_cidr = 123
-        mac = '00:16:3e:33:44:55'
-        self.assertRaises(TypeError, data_utils.get_ipv6_addr_by_EUI64,
-                          bad_cidr, mac)
-
-    def test_get_ipv6_addr_by_EUI64_bad_cidr_value(self):
-        bad_cidr = 'bb'
-        mac = '00:16:3e:33:44:55'
-        self.assertRaises(TypeError, data_utils.get_ipv6_addr_by_EUI64,
-                          bad_cidr, mac)
-
-    def test_get_ipv6_addr_by_EUI64_bad_mac_value(self):
-        cidr = '2001:db8::'
-        bad_mac = '00:16:3e:33:44:5Z'
-        self.assertRaises(TypeError, data_utils.get_ipv6_addr_by_EUI64,
-                          cidr, bad_mac)
-
-    def test_get_ipv6_addr_by_EUI64_bad_mac_type(self):
-        cidr = '2001:db8::'
-        bad_mac = 99999999999999999999
-        self.assertRaises(TypeError, data_utils.get_ipv6_addr_by_EUI64,
-                          cidr, bad_mac)
-
     def test_chunkify(self):
         data = "aaa"
         chunks = data_utils.chunkify(data, 2)