diff --git a/tempest/api/identity/admin/v3/test_users_negative.py b/tempest/api/identity/admin/v3/test_users_negative.py
index ca2aaa4..d40a5b9 100644
--- a/tempest/api/identity/admin/v3/test_users_negative.py
+++ b/tempest/api/identity/admin/v3/test_users_negative.py
@@ -33,3 +33,14 @@
                           u_name, u_password,
                           email=u_email,
                           domain_id=data_utils.rand_uuid_hex())
+
+    @test.attr(type=['negative'])
+    @test.idempotent_id('b3c9fccc-4134-46f5-b600-1da6fb0a3b1f')
+    def test_authentication_for_disabled_user(self):
+        # Attempt to authenticate for disabled user should fail
+        self.data.setup_test_v3_user()
+        self.disable_user(self.data.test_user)
+        self.assertRaises(lib_exc.Unauthorized, self.token.auth,
+                          username=self.data.test_user,
+                          password=self.data.test_password,
+                          user_domain_id='default')
diff --git a/tempest/api/identity/base.py b/tempest/api/identity/base.py
index c56f4fb..0364f3a 100644
--- a/tempest/api/identity/base.py
+++ b/tempest/api/identity/base.py
@@ -170,6 +170,11 @@
         if len(role) > 0:
             return role[0]
 
+    @classmethod
+    def disable_user(cls, user_name):
+        user = cls.get_user_by_name(user_name)
+        cls.client.update_user(user['id'], user_name, enabled=False)
+
     def delete_domain(self, domain_id):
         # NOTE(mpavlase) It is necessary to disable the domain before deleting
         # otherwise it raises Forbidden exception
diff --git a/tempest/api/network/base.py b/tempest/api/network/base.py
index b798cb2..b4ea29b 100644
--- a/tempest/api/network/base.py
+++ b/tempest/api/network/base.py
@@ -105,7 +105,7 @@
             # Clean up metering labels
             for metering_label in cls.metering_labels:
                 cls._try_delete_resource(
-                    cls.admin_client.delete_metering_label,
+                    cls.admin_metering_labels_client.delete_metering_label,
                     metering_label['id'])
             # Clean up ports
             for port in cls.ports:
@@ -272,11 +272,12 @@
         cls.admin_subnets_client = cls.os_adm.subnets_client
         cls.admin_ports_client = cls.os_adm.ports_client
         cls.admin_floating_ips_client = cls.os_adm.floating_ips_client
+        cls.admin_metering_labels_client = cls.os_adm.metering_labels_client
 
     @classmethod
     def create_metering_label(cls, name, description):
         """Wrapper utility that returns a test metering label."""
-        body = cls.admin_client.create_metering_label(
+        body = cls.admin_metering_labels_client.create_metering_label(
             description=description,
             name=data_utils.rand_name("metering-label"))
         metering_label = body['metering_label']
diff --git a/tempest/api/network/test_metering_extensions.py b/tempest/api/network/test_metering_extensions.py
index a213f92..c4021b4 100644
--- a/tempest/api/network/test_metering_extensions.py
+++ b/tempest/api/network/test_metering_extensions.py
@@ -51,9 +51,11 @@
 
     def _delete_metering_label(self, metering_label_id):
         # Deletes a label and verifies if it is deleted or not
-        self.admin_client.delete_metering_label(metering_label_id)
+        self.admin_metering_labels_client.delete_metering_label(
+            metering_label_id)
         # Asserting that the label is not found in list after deletion
-        labels = self.admin_client.list_metering_labels(id=metering_label_id)
+        labels = self.admin_metering_labels_client.list_metering_labels(
+            id=metering_label_id)
         self.assertEqual(len(labels['metering_labels']), 0)
 
     def _delete_metering_label_rule(self, metering_label_rule_id):
@@ -68,7 +70,7 @@
     @test.idempotent_id('e2fb2f8c-45bf-429a-9f17-171c70444612')
     def test_list_metering_labels(self):
         # Verify label filtering
-        body = self.admin_client.list_metering_labels(id=33)
+        body = self.admin_metering_labels_client.list_metering_labels(id=33)
         metering_labels = body['metering_labels']
         self.assertEqual(0, len(metering_labels))
 
@@ -77,21 +79,22 @@
         # Creates a label
         name = data_utils.rand_name('metering-label-')
         description = "label created by tempest"
-        body = self.admin_client.create_metering_label(name=name,
-                                                       description=description)
+        body = self.admin_metering_labels_client.create_metering_label(
+            name=name, description=description)
         metering_label = body['metering_label']
         self.addCleanup(self._delete_metering_label,
                         metering_label['id'])
         # Assert whether created labels are found in labels list or fail
         # if created labels are not found in labels list
-        labels = (self.admin_client.list_metering_labels(
+        labels = (self.admin_metering_labels_client.list_metering_labels(
                   id=metering_label['id']))
         self.assertEqual(len(labels['metering_labels']), 1)
 
     @test.idempotent_id('30abb445-0eea-472e-bd02-8649f54a5968')
     def test_show_metering_label(self):
         # Verifies the details of a label
-        body = self.admin_client.show_metering_label(self.metering_label['id'])
+        body = self.admin_metering_labels_client.show_metering_label(
+            self.metering_label['id'])
         metering_label = body['metering_label']
         self.assertEqual(self.metering_label['id'], metering_label['id'])
         self.assertEqual(self.metering_label['tenant_id'],
diff --git a/tempest/clients.py b/tempest/clients.py
index 2566d79..8f63ab1 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -107,6 +107,8 @@
 from tempest.services.messaging.json.messaging_client import \
     MessagingClient
 from tempest.services.network.json.floating_ips_client import FloatingIPsClient
+from tempest.services.network.json.metering_labels_client import \
+    MeteringLabelsClient
 from tempest.services.network.json.network_client import NetworkClient
 from tempest.services.network.json.networks_client import NetworksClient
 from tempest.services.network.json.ports_client import PortsClient
@@ -230,6 +232,14 @@
             build_interval=CONF.network.build_interval,
             build_timeout=CONF.network.build_timeout,
             **self.default_params)
+        self.metering_labels_client = MeteringLabelsClient(
+            self.auth_provider,
+            CONF.network.catalog_type,
+            CONF.network.region or CONF.identity.region,
+            endpoint_type=CONF.network.endpoint_type,
+            build_interval=CONF.network.build_interval,
+            build_timeout=CONF.network.build_timeout,
+            **self.default_params)
         self.messaging_client = MessagingClient(
             self.auth_provider,
             CONF.messaging.catalog_type,
diff --git a/tempest/cmd/cleanup_service.py b/tempest/cmd/cleanup_service.py
index ba6bf6c..f2dd7af 100644
--- a/tempest/cmd/cleanup_service.py
+++ b/tempest/cmd/cleanup_service.py
@@ -387,6 +387,7 @@
         self.subnets_client = manager.subnets_client
         self.ports_client = manager.ports_client
         self.floating_ips_client = manager.floating_ips_client
+        self.metering_labels_client = manager.metering_labels_client
 
     def _filter_by_conf_networks(self, item_list):
         if not item_list or not all(('network_id' in i for i in item_list)):
@@ -600,7 +601,7 @@
 class NetworkMeteringLabelService(NetworkService):
 
     def list(self):
-        client = self.client
+        client = self.metering_labels_client
         labels = client.list_metering_labels()
         labels = labels['metering_labels']
         labels = self._filter_by_tenant_id(labels)
@@ -608,7 +609,7 @@
         return labels
 
     def delete(self):
-        client = self.client
+        client = self.metering_labels_client
         labels = self.list()
         for label in labels:
             try:
diff --git a/tempest/common/glance_http.py b/tempest/common/glance_http.py
index e5431a0..800e977 100644
--- a/tempest/common/glance_http.py
+++ b/tempest/common/glance_http.py
@@ -24,12 +24,10 @@
 
 import OpenSSL
 from oslo_log import log as logging
-from oslo_serialization import jsonutils as json
 import six
 from six import moves
 from six.moves import http_client as httplib
 from six.moves.urllib import parse as urlparse
-from tempest_lib import exceptions as lib_exc
 
 from tempest import exceptions as exc
 
@@ -51,19 +49,20 @@
         self.endpoint_port = endpoint_parts.port
         self.endpoint_path = endpoint_parts.path
 
-        self.connection_class = self.get_connection_class(self.endpoint_scheme)
-        self.connection_kwargs = self.get_connection_kwargs(
+        self.connection_class = self._get_connection_class(
+            self.endpoint_scheme)
+        self.connection_kwargs = self._get_connection_kwargs(
             self.endpoint_scheme, **kwargs)
 
     @staticmethod
-    def get_connection_class(scheme):
+    def _get_connection_class(scheme):
         if scheme == 'https':
             return VerifiedHTTPSConnection
         else:
             return httplib.HTTPConnection
 
     @staticmethod
-    def get_connection_kwargs(scheme, **kwargs):
+    def _get_connection_kwargs(scheme, **kwargs):
         _kwargs = {'timeout': float(kwargs.get('timeout', 600))}
 
         if scheme == 'https':
@@ -75,7 +74,7 @@
 
         return _kwargs
 
-    def get_connection(self):
+    def _get_connection(self):
         _class = self.connection_class
         try:
             return _class(self.endpoint_hostname, self.endpoint_port,
@@ -95,7 +94,7 @@
 
         self._log_request(method, url, kwargs['headers'])
 
-        conn = self.get_connection()
+        conn = self._get_connection()
 
         try:
             url_parts = urlparse.urlparse(url)
@@ -159,30 +158,6 @@
                 self.LOG.debug("Large body (%d) md5 summary: %s", length,
                                hashlib.md5(str_body).hexdigest())
 
-    def json_request(self, method, url, **kwargs):
-        kwargs.setdefault('headers', {})
-        kwargs['headers'].setdefault('Content-Type', 'application/json')
-        if kwargs['headers']['Content-Type'] != 'application/json':
-            msg = "Only application/json content-type is supported."
-            raise lib_exc.InvalidContentType(msg)
-
-        if 'body' in kwargs:
-            kwargs['body'] = json.dumps(kwargs['body'])
-
-        resp, body_iter = self._http_request(url, method, **kwargs)
-
-        if 'application/json' in resp.getheader('content-type', ''):
-            body = ''.join([chunk for chunk in body_iter])
-            try:
-                body = json.loads(body)
-            except ValueError:
-                LOG.error('Could not decode response body as JSON')
-        else:
-            msg = "Only json/application content-type is supported."
-            raise lib_exc.InvalidContentType(msg)
-
-        return resp, body
-
     def raw_request(self, method, url, **kwargs):
         kwargs.setdefault('headers', {})
         kwargs['headers'].setdefault('Content-Type',
diff --git a/tempest/services/image/v2/json/image_client.py b/tempest/services/image/v2/json/image_client.py
index a7e0f04..f7d70ea 100644
--- a/tempest/services/image/v2/json/image_client.py
+++ b/tempest/services/image/v2/json/image_client.py
@@ -187,6 +187,11 @@
         return service_client.ResponseBody(resp, body)
 
     def update_image_member(self, image_id, member_id, **kwargs):
+        """Update an image member.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref-image-v2.html#updateImageMember-v2
+        """
         url = 'v2/images/%s/members/%s' % (image_id, member_id)
         data = json.dumps(kwargs)
         resp, body = self.put(url, data)
diff --git a/tempest/services/network/json/metering_labels_client.py b/tempest/services/network/json/metering_labels_client.py
new file mode 100644
index 0000000..2e5cdae
--- /dev/null
+++ b/tempest/services/network/json/metering_labels_client.py
@@ -0,0 +1,33 @@
+#    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.
+
+from tempest.services.network.json import base
+
+
+class MeteringLabelsClient(base.BaseNetworkClient):
+
+    def create_metering_label(self, **kwargs):
+        uri = '/metering/metering-labels'
+        post_data = {'metering_label': kwargs}
+        return self.create_resource(uri, post_data)
+
+    def show_metering_label(self, metering_label_id, **fields):
+        uri = '/metering/metering-labels/%s' % metering_label_id
+        return self.show_resource(uri, **fields)
+
+    def delete_metering_label(self, metering_label_id):
+        uri = '/metering/metering-labels/%s' % metering_label_id
+        return self.delete_resource(uri)
+
+    def list_metering_labels(self, **filters):
+        uri = '/metering/metering-labels'
+        return self.list_resources(uri, **filters)
diff --git a/tempest/services/network/json/network_client.py b/tempest/services/network/json/network_client.py
index 5a4229c..b525143 100644
--- a/tempest/services/network/json/network_client.py
+++ b/tempest/services/network/json/network_client.py
@@ -35,23 +35,6 @@
     quotas
     """
 
-    def create_metering_label(self, **kwargs):
-        uri = '/metering/metering-labels'
-        post_data = {'metering_label': kwargs}
-        return self.create_resource(uri, post_data)
-
-    def show_metering_label(self, metering_label_id, **fields):
-        uri = '/metering/metering-labels/%s' % metering_label_id
-        return self.show_resource(uri, **fields)
-
-    def delete_metering_label(self, metering_label_id):
-        uri = '/metering/metering-labels/%s' % metering_label_id
-        return self.delete_resource(uri)
-
-    def list_metering_labels(self, **filters):
-        uri = '/metering/metering-labels'
-        return self.list_resources(uri, **filters)
-
     def create_metering_label_rule(self, **kwargs):
         uri = '/metering/metering-label-rules'
         post_data = {'metering_label_rule': kwargs}
diff --git a/tempest/tests/test_glance_http.py b/tempest/tests/test_glance_http.py
index 105caec..ed886da 100644
--- a/tempest/tests/test_glance_http.py
+++ b/tempest/tests/test_glance_http.py
@@ -13,14 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import socket
-
 import mock
-from oslo_serialization import jsonutils as json
 from oslotest import mockpatch
 import six
 from six.moves import http_client as httplib
-from tempest_lib import exceptions as lib_exc
 
 from tempest.common import glance_http
 from tempest import exceptions
@@ -56,60 +52,6 @@
                         'getresponse', return_value=resp))
         return resp
 
-    def test_json_request_without_content_type_header_in_response(self):
-        self._set_response_fixture({}, 200, 'fake_response_body')
-        self.assertRaises(lib_exc.InvalidContentType,
-                          self.client.json_request, 'GET', '/images')
-
-    def test_json_request_with_xml_content_type_header_in_request(self):
-        self.assertRaises(lib_exc.InvalidContentType,
-                          self.client.json_request, 'GET', '/images',
-                          headers={'Content-Type': 'application/xml'})
-
-    def test_json_request_with_xml_content_type_header_in_response(self):
-        self._set_response_fixture({'content-type': 'application/xml'},
-                                   200, 'fake_response_body')
-        self.assertRaises(lib_exc.InvalidContentType,
-                          self.client.json_request, 'GET', '/images')
-
-    def test_json_request_with_json_content_type_header_only_in_resp(self):
-        self._set_response_fixture({'content-type': 'application/json'},
-                                   200, 'fake_response_body')
-        resp, body = self.client.json_request('GET', '/images')
-        self.assertEqual(200, resp.status)
-        self.assertEqual('fake_response_body', body)
-
-    def test_json_request_with_json_content_type_header_in_req_and_resp(self):
-        self._set_response_fixture({'content-type': 'application/json'},
-                                   200, 'fake_response_body')
-        resp, body = self.client.json_request('GET', '/images', headers={
-            'Content-Type': 'application/json'})
-        self.assertEqual(200, resp.status)
-        self.assertEqual('fake_response_body', body)
-
-    def test_json_request_fails_to_json_loads(self):
-        self._set_response_fixture({'content-type': 'application/json'},
-                                   200, 'fake_response_body')
-        self.useFixture(mockpatch.PatchObject(json, 'loads',
-                        side_effect=ValueError()))
-        resp, body = self.client.json_request('GET', '/images')
-        self.assertEqual(200, resp.status)
-        self.assertEqual(body, 'fake_response_body')
-
-    def test_json_request_socket_timeout(self):
-        self.useFixture(mockpatch.PatchObject(httplib.HTTPConnection,
-                                              'request',
-                                              side_effect=socket.timeout()))
-        self.assertRaises(exceptions.TimeoutException,
-                          self.client.json_request, 'GET', '/images')
-
-    def test_json_request_endpoint_not_found(self):
-        self.useFixture(mockpatch.PatchObject(httplib.HTTPConnection,
-                                              'request',
-                                              side_effect=socket.gaierror()))
-        self.assertRaises(exceptions.EndpointNotFound,
-                          self.client.json_request, 'GET', '/images')
-
     def test_raw_request(self):
         self._set_response_fixture({}, 200, 'fake_response_body')
         resp, body = self.client.raw_request('GET', '/images')
@@ -141,22 +83,22 @@
         self.assertEqual(call_count - 1, req_body.tell())
 
     def test_get_connection_class_for_https(self):
-        conn_class = self.client.get_connection_class('https')
+        conn_class = self.client._get_connection_class('https')
         self.assertEqual(glance_http.VerifiedHTTPSConnection, conn_class)
 
     def test_get_connection_class_for_http(self):
-        conn_class = (self.client.get_connection_class('http'))
+        conn_class = (self.client._get_connection_class('http'))
         self.assertEqual(httplib.HTTPConnection, conn_class)
 
     def test_get_connection_http(self):
-        self.assertTrue(isinstance(self.client.get_connection(),
+        self.assertTrue(isinstance(self.client._get_connection(),
                                    httplib.HTTPConnection))
 
     def test_get_connection_https(self):
         endpoint = 'https://fake_url.com'
         self.fake_auth.base_url = mock.MagicMock(return_value=endpoint)
         self.client = glance_http.HTTPClient(self.fake_auth, {})
-        self.assertTrue(isinstance(self.client.get_connection(),
+        self.assertTrue(isinstance(self.client._get_connection(),
                                    glance_http.VerifiedHTTPSConnection))
 
     def test_get_connection_url_not_fount(self):
@@ -164,22 +106,22 @@
                                               side_effect=httplib.InvalidURL()
                                               ))
         self.assertRaises(exceptions.EndpointNotFound,
-                          self.client.get_connection)
+                          self.client._get_connection)
 
     def test_get_connection_kwargs_default_for_http(self):
-        kwargs = self.client.get_connection_kwargs('http')
+        kwargs = self.client._get_connection_kwargs('http')
         self.assertEqual(600, kwargs['timeout'])
         self.assertEqual(1, len(kwargs.keys()))
 
     def test_get_connection_kwargs_set_timeout_for_http(self):
-        kwargs = self.client.get_connection_kwargs('http', timeout=10,
-                                                   ca_certs='foo')
+        kwargs = self.client._get_connection_kwargs('http', timeout=10,
+                                                    ca_certs='foo')
         self.assertEqual(10, kwargs['timeout'])
         # nothing more than timeout is evaluated for http connections
         self.assertEqual(1, len(kwargs.keys()))
 
     def test_get_connection_kwargs_default_for_https(self):
-        kwargs = self.client.get_connection_kwargs('https')
+        kwargs = self.client._get_connection_kwargs('https')
         self.assertEqual(600, kwargs['timeout'])
         self.assertEqual(None, kwargs['ca_certs'])
         self.assertEqual(None, kwargs['cert_file'])
@@ -189,12 +131,12 @@
         self.assertEqual(6, len(kwargs.keys()))
 
     def test_get_connection_kwargs_set_params_for_https(self):
-        kwargs = self.client.get_connection_kwargs('https', timeout=10,
-                                                   ca_certs='foo',
-                                                   cert_file='/foo/bar.cert',
-                                                   key_file='/foo/key.pem',
-                                                   insecure=True,
-                                                   ssl_compression=False)
+        kwargs = self.client._get_connection_kwargs('https', timeout=10,
+                                                    ca_certs='foo',
+                                                    cert_file='/foo/bar.cert',
+                                                    key_file='/foo/key.pem',
+                                                    insecure=True,
+                                                    ssl_compression=False)
         self.assertEqual(10, kwargs['timeout'])
         self.assertEqual('foo', kwargs['ca_certs'])
         self.assertEqual('/foo/bar.cert', kwargs['cert_file'])