diff --git a/tempest/api/compute/images/test_images.py b/tempest/api/compute/images/test_images.py
index 150e8af..3754637 100644
--- a/tempest/api/compute/images/test_images.py
+++ b/tempest/api/compute/images/test_images.py
@@ -49,6 +49,9 @@
                                               name=snapshot_name,
                                               wait_until='SAVING')
         self.client.delete_image(image['id'])
+        msg = ('The image with ID {image_id} failed to be deleted'
+               .format(image_id=image['id']))
+        self.assertTrue(self.client.is_resource_deleted(image['id']), msg)
 
     @test.idempotent_id('aaacd1d0-55a2-4ce8-818a-b5439df8adc9')
     def test_create_image_from_stopped_server(self):
diff --git a/tempest/api/compute/volumes/test_volumes_get.py b/tempest/api/compute/volumes/test_volumes_get.py
index 6074054..c276fe0 100644
--- a/tempest/api/compute/volumes/test_volumes_get.py
+++ b/tempest/api/compute/volumes/test_volumes_get.py
@@ -42,15 +42,14 @@
     @test.idempotent_id('f10f25eb-9775-4d9d-9cbe-1cf54dae9d5f')
     def test_volume_create_get_delete(self):
         # CREATE, GET, DELETE Volume
-        volume = None
         v_name = data_utils.rand_name('Volume')
         metadata = {'Type': 'work'}
         # Create volume
         volume = self.client.create_volume(size=CONF.volume.volume_size,
                                            display_name=v_name,
                                            metadata=metadata)['volume']
-        self.addCleanup(self.delete_volume, volume['id'])
         self.assertIn('id', volume)
+        self.addCleanup(self.delete_volume, volume['id'])
         self.assertIn('displayName', volume)
         self.assertEqual(volume['displayName'], v_name,
                          "The created volume name is not equal "
@@ -66,6 +65,10 @@
                          fetched_volume['displayName'],
                          'The fetched Volume is different '
                          'from the created Volume')
+        self.assertEqual(CONF.volume.volume_size,
+                         fetched_volume['size'],
+                         'The fetched volume size is different '
+                         'from the created Volume')
         self.assertEqual(volume['id'],
                          fetched_volume['id'],
                          'The fetched Volume is different '
diff --git a/tempest/api/identity/admin/v3/test_credentials.py b/tempest/api/identity/admin/v3/test_credentials.py
index 7c2e8e0..12b236f 100644
--- a/tempest/api/identity/admin/v3/test_credentials.py
+++ b/tempest/api/identity/admin/v3/test_credentials.py
@@ -37,7 +37,7 @@
             cls.projects.append(cls.project['id'])
 
         cls.user_body = cls.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email, project_id=cls.projects[0])['user']
 
     @classmethod
diff --git a/tempest/api/identity/admin/v3/test_default_project_id.py b/tempest/api/identity/admin/v3/test_default_project_id.py
index a540da7..3616e77 100644
--- a/tempest/api/identity/admin/v3/test_default_project_id.py
+++ b/tempest/api/identity/admin/v3/test_default_project_id.py
@@ -54,7 +54,7 @@
         # default project
         user_name = data_utils.rand_name('user')
         user_body = self.users_client.create_user(
-            user_name,
+            name=user_name,
             password=user_name,
             domain_id=dom_id,
             default_project_id=proj_id)['user']
diff --git a/tempest/api/identity/admin/v3/test_groups.py b/tempest/api/identity/admin/v3/test_groups.py
index 59fcec6..48e5f02 100644
--- a/tempest/api/identity/admin/v3/test_groups.py
+++ b/tempest/api/identity/admin/v3/test_groups.py
@@ -83,7 +83,8 @@
         for i in range(3):
             name = data_utils.rand_name('User')
             password = data_utils.rand_password()
-            user = self.users_client.create_user(name, password)['user']
+            user = self.users_client.create_user(name=name,
+                                                 password=password)['user']
             users.append(user)
             self.addCleanup(self.users_client.delete_user, user['id'])
             self.groups_client.add_group_user(group['id'], user['id'])
@@ -103,7 +104,8 @@
     def test_list_user_groups(self):
         # create a user
         user = self.users_client.create_user(
-            data_utils.rand_name('User'), data_utils.rand_password())['user']
+            name=data_utils.rand_name('User'),
+            password=data_utils.rand_password())['user']
         self.addCleanup(self.users_client.delete_user, user['id'])
         # create two groups, and add user into them
         groups = []
diff --git a/tempest/api/identity/admin/v3/test_inherits.py b/tempest/api/identity/admin/v3/test_inherits.py
index fe20349..0d3d1d6 100644
--- a/tempest/api/identity/admin/v3/test_inherits.py
+++ b/tempest/api/identity/admin/v3/test_inherits.py
@@ -44,7 +44,7 @@
             name=data_utils.rand_name('group-'), project_id=cls.project['id'],
             domain_id=cls.domain['id'])['group']
         cls.user = cls.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email, project_id=cls.project['id'],
             domain_id=cls.domain['id'])['user']
 
diff --git a/tempest/api/identity/admin/v3/test_list_users.py b/tempest/api/identity/admin/v3/test_list_users.py
index 9691ee8..99df559 100644
--- a/tempest/api/identity/admin/v3/test_list_users.py
+++ b/tempest/api/identity/admin/v3/test_list_users.py
@@ -25,7 +25,7 @@
         # assert the response based on expected and not_expected
         # expected: user expected in the list response
         # not_expected: user, which should not be present in list response
-        body = self.users_client.list_users(params)['users']
+        body = self.users_client.list_users(**params)['users']
         self.assertIn(expected[key], map(lambda x: x[key], body))
         self.assertNotIn(not_expected[key],
                          map(lambda x: x[key], body))
@@ -42,13 +42,13 @@
         cls.users = list()
         u1_name = data_utils.rand_name('test_user')
         cls.domain_enabled_user = cls.users_client.create_user(
-            u1_name, password=alt_password,
+            name=u1_name, password=alt_password,
             email=cls.alt_email, domain_id=cls.domain['id'])['user']
         cls.users.append(cls.domain_enabled_user)
         # Create default not enabled user
         u2_name = data_utils.rand_name('test_user')
         cls.non_domain_enabled_user = cls.users_client.create_user(
-            u2_name, password=alt_password,
+            name=u2_name, password=alt_password,
             email=cls.alt_email, enabled=False)['user']
         cls.users.append(cls.non_domain_enabled_user)
 
diff --git a/tempest/api/identity/admin/v3/test_projects.py b/tempest/api/identity/admin/v3/test_projects.py
index 1879e46..1137191 100644
--- a/tempest/api/identity/admin/v3/test_projects.py
+++ b/tempest/api/identity/admin/v3/test_projects.py
@@ -200,7 +200,7 @@
         u_email = u_name + '@testmail.tm'
         u_password = data_utils.rand_password()
         user = self.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email, project_id=project['id'])['user']
         # Delete the User at the end of this method
         self.addCleanup(self.users_client.delete_user, user['id'])
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index 2b77023..4ecf0a5 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -44,7 +44,7 @@
             name=data_utils.rand_name('Group'), project_id=cls.project['id'],
             domain_id=cls.domain['id'])['group']
         cls.user_body = cls.users_client.create_user(
-            u_name, description=u_desc, password=cls.u_password,
+            name=u_name, description=u_desc, password=cls.u_password,
             email=u_email, project_id=cls.project['id'],
             domain_id=cls.domain['id'])['user']
         cls.role = cls.roles_client.create_role(
diff --git a/tempest/api/identity/admin/v3/test_tokens.py b/tempest/api/identity/admin/v3/test_tokens.py
index 89cfd5b..fcf4772 100644
--- a/tempest/api/identity/admin/v3/test_tokens.py
+++ b/tempest/api/identity/admin/v3/test_tokens.py
@@ -32,7 +32,7 @@
         u_email = '%s@testmail.tm' % u_name
         u_password = data_utils.rand_password()
         user = self.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email)['user']
         self.addCleanup(self.users_client.delete_user, user['id'])
         # Perform Authentication
@@ -62,7 +62,7 @@
         # Create a user.
         user_name = data_utils.rand_name(name='user')
         user_password = data_utils.rand_password()
-        user = self.users_client.create_user(user_name,
+        user = self.users_client.create_user(name=user_name,
                                              password=user_password)['user']
         self.addCleanup(self.users_client.delete_user, user['id'])
 
diff --git a/tempest/api/identity/admin/v3/test_trusts.py b/tempest/api/identity/admin/v3/test_trusts.py
index 9c8f1f6..58e2ab8 100644
--- a/tempest/api/identity/admin/v3/test_trusts.py
+++ b/tempest/api/identity/admin/v3/test_trusts.py
@@ -57,7 +57,7 @@
         u_email = self.trustor_username + '@testmail.xx'
         self.trustor_password = data_utils.rand_password()
         user = self.users_client.create_user(
-            self.trustor_username,
+            name=self.trustor_username,
             description=u_desc,
             password=self.trustor_password,
             email=u_email,
diff --git a/tempest/api/identity/admin/v3/test_users.py b/tempest/api/identity/admin/v3/test_users.py
index f200095..1bcec62 100644
--- a/tempest/api/identity/admin/v3/test_users.py
+++ b/tempest/api/identity/admin/v3/test_users.py
@@ -31,7 +31,7 @@
         u_email = u_name + '@testmail.tm'
         u_password = data_utils.rand_password()
         user = self.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email, enabled=False)['user']
         # Delete the User at the end of this method
         self.addCleanup(self.users_client.delete_user, user['id'])
@@ -71,7 +71,7 @@
         u_name = data_utils.rand_name('user')
         original_password = data_utils.rand_password()
         user = self.users_client.create_user(
-            u_name, password=original_password)['user']
+            name=u_name, password=original_password)['user']
         # Delete the User at the end all test methods
         self.addCleanup(self.users_client.delete_user, user['id'])
         # Update user with new password
@@ -107,7 +107,7 @@
         u_email = u_name + '@testmail.tm'
         u_password = data_utils.rand_password()
         user_body = self.users_client.create_user(
-            u_name, description=u_desc, password=u_password,
+            name=u_name, description=u_desc, password=u_password,
             email=u_email, enabled=False, project_id=u_project['id'])['user']
         # Delete the User at the end of this method
         self.addCleanup(self.users_client.delete_user, user_body['id'])
diff --git a/tempest/api/identity/admin/v3/test_users_negative.py b/tempest/api/identity/admin/v3/test_users_negative.py
index 71e8bc5..5b0fc97 100644
--- a/tempest/api/identity/admin/v3/test_users_negative.py
+++ b/tempest/api/identity/admin/v3/test_users_negative.py
@@ -29,7 +29,7 @@
         u_email = u_name + '@testmail.tm'
         u_password = data_utils.rand_password()
         self.assertRaises(lib_exc.NotFound, self.users_client.create_user,
-                          u_name, u_password,
+                          name=u_name, password=u_password,
                           email=u_email,
                           domain_id=data_utils.rand_uuid_hex())
 
diff --git a/tempest/api/identity/base.py b/tempest/api/identity/base.py
index ce052e6..b512d50 100644
--- a/tempest/api/identity/base.py
+++ b/tempest/api/identity/base.py
@@ -39,7 +39,7 @@
     def get_user_by_name(cls, name, domain_id=None):
         if domain_id:
             params = {'domain_id': domain_id}
-            users = cls.users_client.list_users(params)['users']
+            users = cls.users_client.list_users(**params)['users']
         else:
             users = cls.users_client.list_users()['users']
         user = [u for u in users if u['name'] == name]
@@ -200,7 +200,7 @@
     @classmethod
     def disable_user(cls, user_name, domain_id=None):
         user = cls.get_user_by_name(user_name, domain_id)
-        cls.users_client.update_user(user['id'], user_name, enabled=False)
+        cls.users_client.update_user(user['id'], name=user_name, enabled=False)
 
     @classmethod
     def create_domain(cls):
@@ -221,7 +221,7 @@
         project = self.setup_test_project()
         username = data_utils.rand_name('test_user')
         email = username + '@testmail.tm'
-        user = self._create_test_user(user_name=username, email=email,
+        user = self._create_test_user(name=username, email=email,
                                       project_id=project['id'],
                                       password=password)
         return user
diff --git a/tempest/api/object_storage/test_account_quotas_negative.py b/tempest/api/object_storage/test_account_quotas_negative.py
index 0eec387..ae8dfcc 100644
--- a/tempest/api/object_storage/test_account_quotas_negative.py
+++ b/tempest/api/object_storage/test_account_quotas_negative.py
@@ -13,9 +13,7 @@
 # under the License.
 
 from tempest.api.object_storage import base
-from tempest.common.utils import data_utils
 from tempest import config
-from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 from tempest import test
 
@@ -91,14 +89,3 @@
         self.assertRaises(lib_exc.Forbidden,
                           self.account_client.create_account_metadata,
                           {"Quota-Bytes": "100"})
-
-    @test.attr(type=["negative"])
-    @decorators.skip_because(bug="1310597")
-    @test.idempotent_id('cf9e21f5-3aa4-41b1-9462-28ac550d8d3f')
-    @test.requires_ext(extension='account_quotas', service='object')
-    def test_upload_large_object(self):
-        object_name = data_utils.rand_name(name="TestObject")
-        data = data_utils.arbitrary_string(30)
-        self.assertRaises(lib_exc.OverLimit,
-                          self.object_client.create_object,
-                          self.container_name, object_name, data)
diff --git a/tempest/api/volume/test_volumes_list.py b/tempest/api/volume/test_volumes_list.py
index f7176f4..b5ef7c0 100644
--- a/tempest/api/volume/test_volumes_list.py
+++ b/tempest/api/volume/test_volumes_list.py
@@ -61,20 +61,11 @@
 
         # Create 3 test volumes
         cls.volume_list = []
-        cls.volume_id_list = []
         cls.metadata = {'Type': 'work'}
         for i in range(3):
             volume = cls.create_volume(metadata=cls.metadata)
             volume = cls.client.show_volume(volume['id'])['volume']
             cls.volume_list.append(volume)
-            cls.volume_id_list.append(volume['id'])
-
-    @classmethod
-    def resource_cleanup(cls):
-        # Delete the created volumes
-        for volid in cls.volume_id_list:
-            cls.delete_volume(cls.client, volid)
-        super(VolumesV2ListTestJSON, cls).resource_cleanup()
 
     def _list_by_param_value_and_assert(self, params, with_detail=False):
         """list or list_details with given params and validates result"""
diff --git a/tempest/api/volume/v2/test_volumes_list.py b/tempest/api/volume/v2/test_volumes_list.py
index 1fdcb49..c501ffc 100644
--- a/tempest/api/volume/v2/test_volumes_list.py
+++ b/tempest/api/volume/v2/test_volumes_list.py
@@ -42,22 +42,13 @@
         super(VolumesV2ListTestJSON, cls).resource_setup()
 
         # Create 3 test volumes
-        cls.volume_list = []
         cls.volume_id_list = []
         cls.metadata = {'Type': 'work'}
         for i in range(3):
             volume = cls.create_volume(metadata=cls.metadata)
             volume = cls.client.show_volume(volume['id'])['volume']
-            cls.volume_list.append(volume)
             cls.volume_id_list.append(volume['id'])
 
-    @classmethod
-    def resource_cleanup(cls):
-        # Delete the created volumes
-        for volid in cls.volume_id_list:
-            cls.delete_volume(cls.client, volid)
-        super(VolumesV2ListTestJSON, cls).resource_cleanup()
-
     @test.idempotent_id('2a7064eb-b9c3-429b-b888-33928fc5edd3')
     def test_volume_list_details_with_multiple_params(self):
         # List volumes detail using combined condition
diff --git a/tempest/clients.py b/tempest/clients.py
index 406f9d5..e14f6f8 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -97,19 +97,16 @@
         This uses `config.service_client_config` for all services to collect
         most configuration items needed to init the clients.
         """
-        # NOTE(andreaf) Configuration items will be passed in future patches
-        # into ClientFactory objects, but for now we update all the
-        # _set_*_client methods to consume them so we can verify that the
-        # configuration collected is correct
+        # NOTE(andreaf) Once all service clients in Tempest are migrated
+        # to tempest.lib, their configuration will be picked up from the
+        # registry, and this method will become redundant.
 
         configuration = {}
 
-        # Setup the parameters for all Tempest services.
+        # Setup the parameters for all Tempest services which are not in lib.
         # NOTE(andreaf) Since client.py is an internal module of Tempest,
         # it doesn't have to consider plugin configuration.
-        all_tempest_modules = (set(clients.tempest_modules()) |
-                               clients._tempest_internal_modules())
-        for service in all_tempest_modules:
+        for service in clients._tempest_internal_modules():
             try:
                 # NOTE(andreaf) Use the unversioned service name to fetch
                 # the configuration since configuration is not versioned.
diff --git a/tempest/cmd/init.py b/tempest/cmd/init.py
index e3788ab..bf7289a 100644
--- a/tempest/cmd/init.py
+++ b/tempest/cmd/init.py
@@ -89,18 +89,28 @@
         with open(testr_conf_path, 'w+') as testr_conf_file:
             testr_conf_file.write(testr_conf)
 
-    def update_local_conf(self, conf_path, lock_dir, log_dir):
+    def get_configparser(self, conf_path):
         config_parse = moves.configparser.SafeConfigParser()
         config_parse.optionxform = str
-        with open(conf_path, 'a+') as conf_file:
-            # Set local lock_dir in tempest conf
-            if not config_parse.has_section('oslo_concurrency'):
-                config_parse.add_section('oslo_concurrency')
-            config_parse.set('oslo_concurrency', 'lock_path', lock_dir)
-            # Set local log_dir in tempest conf
-            config_parse.set('DEFAULT', 'log_dir', log_dir)
-            # Set default log filename to tempest.log
-            config_parse.set('DEFAULT', 'log_file', 'tempest.log')
+        # get any existing values if a config file already exists
+        if os.path.isfile(conf_path):
+            # use read() for Python 2 and 3 compatibility
+            config_parse.read(conf_path)
+        return config_parse
+
+    def update_local_conf(self, conf_path, lock_dir, log_dir):
+        config_parse = self.get_configparser(conf_path)
+        # Set local lock_dir in tempest conf
+        if not config_parse.has_section('oslo_concurrency'):
+            config_parse.add_section('oslo_concurrency')
+        config_parse.set('oslo_concurrency', 'lock_path', lock_dir)
+        # Set local log_dir in tempest conf
+        config_parse.set('DEFAULT', 'log_dir', log_dir)
+        # Set default log filename to tempest.log
+        config_parse.set('DEFAULT', 'log_file', 'tempest.log')
+
+        # write out a new file with the updated configurations
+        with open(conf_path, 'w+') as conf_file:
             config_parse.write(conf_file)
 
     def copy_config(self, etc_dir, config_dir):
diff --git a/tempest/cmd/verify_tempest_config.py b/tempest/cmd/verify_tempest_config.py
index 77b88f9..9947f2a 100644
--- a/tempest/cmd/verify_tempest_config.py
+++ b/tempest/cmd/verify_tempest_config.py
@@ -147,6 +147,10 @@
             contains_version('v2.', versions)):
         print_and_or_update('api_v2', 'volume-feature-enabled',
                             not CONF.volume_feature_enabled.api_v2, update)
+    if (CONF.volume_feature_enabled.api_v3 !=
+            contains_version('v3.', versions)):
+        print_and_or_update('api_v3', 'volume-feature-enabled',
+                            not CONF.volume_feature_enabled.api_v3, update)
 
 
 def verify_api_versions(os, service, update):
diff --git a/tempest/common/cred_client.py b/tempest/common/cred_client.py
index 2ca9f40..4e3c395 100644
--- a/tempest/common/cred_client.py
+++ b/tempest/common/cred_client.py
@@ -40,8 +40,10 @@
         self.roles_client = roles_client
 
     def create_user(self, username, password, project, email):
-        params = self._create_user_params(username, password,
-                                          project['id'], email)
+        params = {'name': username,
+                  'password': password,
+                  self.project_id_param: project['id'],
+                  'email': email}
         user = self.users_client.create_user(**params)
         if 'user' in user:
             user = user['user']
@@ -94,6 +96,7 @@
 
 
 class V2CredsClient(CredsClient):
+    project_id_param = 'tenantId'
 
     def __init__(self, identity_client, projects_client, users_client,
                  roles_client):
@@ -102,13 +105,6 @@
                                             users_client,
                                             roles_client)
 
-    def _create_user_params(self, username, password, project_id, email):
-        params = {'name': username,
-                  'password': password,
-                  'tenantId': project_id,
-                  'email': email}
-        return params
-
     def create_project(self, name, description):
         tenant = self.projects_client.create_tenant(
             name=name, description=description)['tenant']
@@ -135,6 +131,7 @@
 
 
 class V3CredsClient(CredsClient):
+    project_id_param = 'project_id'
 
     def __init__(self, identity_client, projects_client, users_client,
                  roles_client, domains_client, domain_name):
@@ -152,13 +149,6 @@
             msg = "Requested domain %s could not be found" % domain_name
             raise lib_exc.InvalidCredentials(msg)
 
-    def _create_user_params(self, username, password, project_id, email):
-        params = {'user_name': username,
-                  'password': password,
-                  'project_id': project_id,
-                  'email': email}
-        return params
-
     def create_project(self, name, description):
         project = self.projects_client.create_project(
             name=name, description=description,
diff --git a/tempest/config.py b/tempest/config.py
index 84edede..3fd20ab 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -26,6 +26,7 @@
 import testtools
 
 from tempest.lib import exceptions
+from tempest.lib.services import clients
 from tempest.test_discover import plugins
 
 
@@ -1288,6 +1289,15 @@
             lockutils.set_defaults(lock_dir)
             self._config = TempestConfigPrivate(config_path=self._path)
 
+            # Pushing tempest internal service client configuration to the
+            # service clients register. Doing this in the config module ensures
+            # that the configuration is available by the time we register the
+            # service clients.
+            # NOTE(andreaf) This has to be done at the time the first
+            # attribute is accessed, to ensure all plugins have been already
+            # loaded, options registered, and _config is set.
+            _register_tempest_service_clients()
+
         return getattr(self._config, attr)
 
     def set_config_path(self, path):
@@ -1447,3 +1457,29 @@
     # Set service
     _parameters['service'] = getattr(options, 'catalog_type')
     return _parameters
+
+
+def _register_tempest_service_clients():
+    # Register tempest own service clients using the same mechanism used
+    # for external plugins.
+    # The configuration data is pushed to the registry so that automatic
+    # configuration of tempest own service clients is possible both for
+    # tempest as well as for the plugins.
+    service_clients = clients.tempest_modules()
+    registry = clients.ClientsRegistry()
+    all_clients = []
+    for service_client in service_clients:
+        module = service_clients[service_client]
+        configs = service_client.split('.')[0]
+        service_client_data = dict(
+            name=service_client.replace('.', '_'),
+            service_version=service_client,
+            module_path=module.__name__,
+            client_names=module.__all__,
+            **service_client_config(configs)
+        )
+        all_clients.append(service_client_data)
+    # NOTE(andreaf) Internal service clients do not actually belong
+    # to a plugin, so using '__tempest__' to indicate a virtual plugin
+    # which holds internal service clients.
+    registry.register_service_client('__tempest__', all_clients)
diff --git a/tempest/lib/services/clients.py b/tempest/lib/services/clients.py
index e782321..adf666b 100644
--- a/tempest/lib/services/clients.py
+++ b/tempest/lib/services/clients.py
@@ -18,7 +18,6 @@
 import importlib
 import inspect
 import logging
-import six
 
 from tempest.lib import auth
 from tempest.lib.common.utils import misc
@@ -90,11 +89,14 @@
                                                 plug_service_versions))
                 raise exceptions.PluginRegistrationException(
                     name=plugin_name, detailed_error=detailed_error)
-            if not plug_service_versions.isdisjoint(_tempest_modules):
+            # NOTE(andreaf) Once all tempest clients are stable, the following
+            # if will have to be removed.
+            if not plug_service_versions.isdisjoint(
+                    _tempest_internal_modules()):
                 detailed_error = (
                     'Plugin %s is trying to register a service %s already '
                     'claimed by a Tempest one' % (plugin_name,
-                                                  _tempest_modules &
+                                                  _tempest_internal_modules() &
                                                   plug_service_versions))
                 raise exceptions.PluginRegistrationException(
                     name=plugin_name, detailed_error=detailed_error)
@@ -351,15 +353,7 @@
             raise exceptions.UnknownServiceClient(
                 services=list(client_parameters.keys()))
 
-        # Register service clients owned by tempest
-        for service, module in six.iteritems(tempest_modules()):
-            attribute = service.replace('.', '_')
-            configs = service.split('.')[0]
-            self.register_service_client_module(
-                attribute, service, module.__name__,
-                module.__all__, **self.parameters[configs])
-
-        # Register service clients from plugins
+        # Register service clients from the registry (__tempest__ and plugins)
         clients_registry = ClientsRegistry()
         plugin_service_clients = clients_registry.get_service_clients()
         for plugin in plugin_service_clients:
@@ -432,6 +426,8 @@
 
     @property
     def registered_services(self):
+        # NOTE(andreaf) Once all tempest modules are stable this needs to
+        # be updated to remove _tempest_internal_modules
         return self._registered_services | _tempest_internal_modules()
 
     def _setup_parameters(self, parameters):
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 952c0c2..6da0570 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -127,6 +127,21 @@
             wait_dict['client'] = waiter_client
         self.cleanup_waits.append(wait_dict)
 
+    def _create_port(self, network_id, client=None, namestart='port-quotatest',
+                     **kwargs):
+        if not client:
+            client = self.ports_client
+        name = data_utils.rand_name(namestart)
+        result = client.create_port(
+            name=name,
+            network_id=network_id,
+            **kwargs)
+        self.assertIsNotNone(result, 'Unable to allocate port')
+        port = result['port']
+        self.addCleanup(test_utils.call_and_ignore_notfound_exc,
+                        client.delete_port, port['id'])
+        return port
+
     def _wait_for_cleanups(self):
         # To handle async delete actions, a list of waits is added
         # which will be iterated over as the last step of clearing the
@@ -209,18 +224,18 @@
                 networks = []
 
             # If there are no networks passed to us we look up
-            # for the project's private networks and create a port
-            # if there is only one private network. The same behaviour
-            # as we would expect when passing the call to the clients
-            # with no networks
+            # for the project's private networks and create a port.
+            # The same behaviour as we would expect when passing
+            # the call to the clients with no networks
             if not networks:
                 networks = clients.networks_client.list_networks(
-                    filters={'router:external': False})
-                self.assertEqual(1, len(networks),
-                                 "There is more than one"
-                                 " network for the tenant")
+                    **{'router:external': False, 'fields': 'id'})['networks']
+
+            # It's net['uuid'] if networks come from kwargs
+            # and net['id'] if they come from
+            # clients.networks_client.list_networks
             for net in networks:
-                net_id = net['uuid']
+                net_id = net.get('uuid', net['id'])
                 if 'port' not in net:
                     port = self._create_port(network_id=net_id,
                                              client=clients.ports_client,
@@ -813,21 +828,6 @@
 
         return subnet
 
-    def _create_port(self, network_id, client=None, namestart='port-quotatest',
-                     **kwargs):
-        if not client:
-            client = self.ports_client
-        name = data_utils.rand_name(namestart)
-        result = client.create_port(
-            name=name,
-            network_id=network_id,
-            **kwargs)
-        self.assertIsNotNone(result, 'Unable to allocate port')
-        port = result['port']
-        self.addCleanup(test_utils.call_and_ignore_notfound_exc,
-                        client.delete_port, port['id'])
-        return port
-
     def _get_server_port_id_and_ip4(self, server, ip_addr=None):
         ports = self._list_ports(device_id=server['id'], fixed_ip=ip_addr)
         # A port can have more then one IP address in some cases.
diff --git a/tempest/services/identity/v3/json/groups_client.py b/tempest/services/identity/v3/json/groups_client.py
index 1a495f8..628b3e1 100644
--- a/tempest/services/identity/v3/json/groups_client.py
+++ b/tempest/services/identity/v3/json/groups_client.py
@@ -18,6 +18,7 @@
 """
 
 from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
 
 from tempest.lib.common import rest_client
 
@@ -44,9 +45,16 @@
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
 
-    def list_groups(self):
-        """Lists the groups."""
-        resp, body = self.get('groups')
+    def list_groups(self, **params):
+        """Lists the groups.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref/identity/v3/#list-groups
+        """
+        url = 'groups'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+        resp, body = self.get(url)
         self.expected_success(200, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
@@ -76,9 +84,16 @@
         self.expected_success(204, resp.status)
         return rest_client.ResponseBody(resp, body)
 
-    def list_group_users(self, group_id):
-        """List users in group."""
-        resp, body = self.get('groups/%s/users' % group_id)
+    def list_group_users(self, group_id, **params):
+        """List users in group.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref/identity/v3/#list-users-in-group
+        """
+        url = 'groups/%s/users' % group_id
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+        resp, body = self.get(url)
         self.expected_success(200, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/identity/v3/json/users_clients.py b/tempest/services/identity/v3/json/users_clients.py
index 73bd343..0dcdacd 100644
--- a/tempest/services/identity/v3/json/users_clients.py
+++ b/tempest/services/identity/v3/json/users_clients.py
@@ -21,56 +21,27 @@
 class UsersClient(rest_client.RestClient):
     api_version = "v3"
 
-    def create_user(self, user_name, password=None, project_id=None,
-                    email=None, domain_id='default', **kwargs):
-        """Creates a user."""
-        en = kwargs.get('enabled', True)
-        description = kwargs.get('description', None)
-        default_project_id = kwargs.get('default_project_id')
-        post_body = {
-            'project_id': project_id,
-            'default_project_id': default_project_id,
-            'description': description,
-            'domain_id': domain_id,
-            'email': email,
-            'enabled': en,
-            'name': user_name,
-            'password': password
-        }
-        post_body = json.dumps({'user': post_body})
+    def create_user(self, **kwargs):
+        """Creates a user.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref/identity/v3/#create-user
+        """
+        post_body = json.dumps({'user': kwargs})
         resp, body = self.post('users', post_body)
         self.expected_success(201, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
 
-    def update_user(self, user_id, name, **kwargs):
+    def update_user(self, user_id, **kwargs):
         """Updates a user.
 
         Available params: see http://developer.openstack.org/
                               api-ref-identity-v3.html#updateUser
         """
-        body = self.show_user(user_id)['user']
-        email = kwargs.get('email', body['email'])
-        en = kwargs.get('enabled', body['enabled'])
-        project_id = kwargs.get('project_id', body['project_id'])
-        if 'default_project_id' in body.keys():
-            default_project_id = kwargs.get('default_project_id',
-                                            body['default_project_id'])
-        else:
-            default_project_id = kwargs.get('default_project_id')
-        description = kwargs.get('description', body['description'])
-        domain_id = kwargs.get('domain_id', body['domain_id'])
-        post_body = {
-            'name': name,
-            'email': email,
-            'enabled': en,
-            'project_id': project_id,
-            'default_project_id': default_project_id,
-            'id': user_id,
-            'domain_id': domain_id,
-            'description': description
-        }
-        post_body = json.dumps({'user': post_body})
+        if 'id' not in kwargs:
+            kwargs['id'] = user_id
+        post_body = json.dumps({'user': kwargs})
         resp, body = self.patch('users/%s' % user_id, post_body)
         self.expected_success(200, resp.status)
         body = json.loads(body)
@@ -87,15 +58,26 @@
         self.expected_success(204, resp.status)
         return rest_client.ResponseBody(resp)
 
-    def list_user_projects(self, user_id):
-        """Lists the projects on which a user has roles assigned."""
-        resp, body = self.get('users/%s/projects' % user_id)
+    def list_user_projects(self, user_id, **params):
+        """Lists the projects on which a user has roles assigned.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref/identity/v3/#list-projects-for-user
+        """
+        url = 'users/%s/projects' % user_id
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+        resp, body = self.get(url)
         self.expected_success(200, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
 
-    def list_users(self, params=None):
-        """Get the list of users."""
+    def list_users(self, **params):
+        """Get the list of users.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref/identity/v3/#list-users
+        """
         url = 'users'
         if params:
             url += '?%s' % urllib.urlencode(params)
@@ -117,9 +99,16 @@
         self.expected_success(204, resp.status)
         return rest_client.ResponseBody(resp, body)
 
-    def list_user_groups(self, user_id):
-        """Lists groups which a user belongs to."""
-        resp, body = self.get('users/%s/groups' % user_id)
+    def list_user_groups(self, user_id, **params):
+        """Lists groups which a user belongs to.
+
+        Available params: see http://developer.openstack.org/
+            api-ref/identity/v3/#list-groups-to-which-a-user-belongs
+        """
+        url = 'users/%s/groups' % user_id
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+        resp, body = self.get(url)
         self.expected_success(200, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
diff --git a/tempest/tests/cmd/test_tempest_init.py b/tempest/tests/cmd/test_tempest_init.py
index 031bf4d..2844371 100644
--- a/tempest/tests/cmd/test_tempest_init.py
+++ b/tempest/tests/cmd/test_tempest_init.py
@@ -45,6 +45,7 @@
         init_cmd = init.TempestInit(None, None)
         local_sample_conf_file = os.path.join(etc_dir_path,
                                               'tempest.conf.sample')
+
         # Verify no sample config file exist
         self.assertFalse(os.path.isfile(local_sample_conf_file))
         init_cmd.generate_sample_config(local_dir.path)
@@ -53,6 +54,52 @@
         self.assertTrue(os.path.isfile(local_sample_conf_file))
         self.assertGreater(os.path.getsize(local_sample_conf_file), 0)
 
+    def test_update_local_conf(self):
+        local_dir = self.useFixture(fixtures.TempDir())
+        etc_dir_path = os.path.join(local_dir.path, 'etc/')
+        os.mkdir(etc_dir_path)
+        lock_dir = os.path.join(local_dir.path, 'tempest_lock')
+        config_path = os.path.join(etc_dir_path, 'tempest.conf')
+        log_dir = os.path.join(local_dir.path, 'logs')
+
+        init_cmd = init.TempestInit(None, None)
+
+        # Generate the config file
+        init_cmd.generate_sample_config(local_dir.path)
+
+        # Create a conf file with populated values
+        config_parser_pre = init_cmd.get_configparser(config_path)
+        with open(config_path, 'w+') as conf_file:
+            # create the same section init will check for and add values to
+            config_parser_pre.add_section('oslo_concurrency')
+            config_parser_pre.set('oslo_concurrency', 'TEST', local_dir.path)
+            # create a new section
+            config_parser_pre.add_section('TEST')
+            config_parser_pre.set('TEST', 'foo', "bar")
+            config_parser_pre.write(conf_file)
+
+        # Update the config file the same way tempest init does
+        init_cmd.update_local_conf(config_path, lock_dir, log_dir)
+
+        # parse the new config file to verify it
+        config_parser_post = init_cmd.get_configparser(config_path)
+
+        # check that our value in oslo_concurrency wasn't overwritten
+        self.assertTrue(config_parser_post.has_section('oslo_concurrency'))
+        self.assertEqual(config_parser_post.get('oslo_concurrency', 'TEST'),
+                         local_dir.path)
+        # check that the lock directory was set correctly
+        self.assertEqual(config_parser_post.get('oslo_concurrency',
+                                                'lock_path'), lock_dir)
+
+        # check that our new section still exists and wasn't modified
+        self.assertTrue(config_parser_post.has_section('TEST'))
+        self.assertEqual(config_parser_post.get('TEST', 'foo'), 'bar')
+
+        # check that the DEFAULT values are correct
+        # NOTE(auggy): has_section ignores DEFAULT
+        self.assertEqual(config_parser_post.get('DEFAULT', 'log_dir'), log_dir)
+
     def test_create_working_dir_with_existing_local_dir_non_empty(self):
         fake_local_dir = self.useFixture(fixtures.TempDir())
         fake_local_conf_dir = self.useFixture(fixtures.TempDir())
diff --git a/tempest/tests/cmd/test_verify_tempest_config.py b/tempest/tests/cmd/test_verify_tempest_config.py
index 70cbf87..00b4542 100644
--- a/tempest/tests/cmd/test_verify_tempest_config.py
+++ b/tempest/tests/cmd/test_verify_tempest_config.py
@@ -188,34 +188,54 @@
                                            False, True)
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
-    def test_verify_cinder_api_versions_no_v2(self, mock_request):
+    def test_verify_cinder_api_versions_no_v3(self, mock_request):
         self.useFixture(mockpatch.PatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
-        fake_resp = {'versions': [{'id': 'v1.0'}]}
+        fake_resp = {'versions': [{'id': 'v1.0'}, {'id': 'v2.0'}]}
         fake_resp = json.dumps(fake_resp)
         mock_request.return_value = (None, fake_resp)
         fake_os = mock.MagicMock()
         with mock.patch.object(verify_tempest_config,
                                'print_and_or_update') as print_mock:
             verify_tempest_config.verify_cinder_api_versions(fake_os, True)
-        print_mock.assert_called_once_with('api_v2', 'volume-feature-enabled',
-                                           False, True)
+        print_mock.assert_not_called()
+
+    @mock.patch('tempest.lib.common.http.ClosingHttp.request')
+    def test_verify_cinder_api_versions_no_v2(self, mock_request):
+        self.useFixture(mockpatch.PatchObject(
+            verify_tempest_config, '_get_unversioned_endpoint',
+            return_value='http://fake_endpoint:5000'))
+        fake_resp = {'versions': [{'id': 'v1.0'}, {'id': 'v3.0'}]}
+        fake_resp = json.dumps(fake_resp)
+        mock_request.return_value = (None, fake_resp)
+        fake_os = mock.MagicMock()
+        with mock.patch.object(verify_tempest_config,
+                               'print_and_or_update') as print_mock:
+            verify_tempest_config.verify_cinder_api_versions(fake_os, True)
+        print_mock.assert_any_call('api_v2', 'volume-feature-enabled',
+                                   False, True)
+        print_mock.assert_any_call('api_v3', 'volume-feature-enabled',
+                                   True, True)
+        self.assertEqual(2, print_mock.call_count)
 
     @mock.patch('tempest.lib.common.http.ClosingHttp.request')
     def test_verify_cinder_api_versions_no_v1(self, mock_request):
         self.useFixture(mockpatch.PatchObject(
             verify_tempest_config, '_get_unversioned_endpoint',
             return_value='http://fake_endpoint:5000'))
-        fake_resp = {'versions': [{'id': 'v2.0'}]}
+        fake_resp = {'versions': [{'id': 'v2.0'}, {'id': 'v3.0'}]}
         fake_resp = json.dumps(fake_resp)
         mock_request.return_value = (None, fake_resp)
         fake_os = mock.MagicMock()
         with mock.patch.object(verify_tempest_config,
                                'print_and_or_update') as print_mock:
             verify_tempest_config.verify_cinder_api_versions(fake_os, True)
-        print_mock.assert_called_once_with('api_v1', 'volume-feature-enabled',
-                                           False, True)
+        print_mock.assert_any_call('api_v1', 'volume-feature-enabled',
+                                   False, True)
+        print_mock.assert_any_call('api_v3', 'volume-feature-enabled',
+                                   True, True)
+        self.assertEqual(2, print_mock.call_count)
 
     def test_verify_glance_version_no_v2_with_v1_1(self):
         def fake_get_versions():