diff --git a/roles/run-tempest/README.rst b/roles/run-tempest/README.rst
index 001586e..b5defb7 100644
--- a/roles/run-tempest/README.rst
+++ b/roles/run-tempest/README.rst
@@ -16,9 +16,19 @@
    :default: ''
 
    A regular expression used to select the tests.
+
    It works only when used with some specific tox environments
    ('all', 'all-plugin'.)
 
+   Multi-line and commented regexs can be achieved by doing this:
+
+       ::
+           vars:
+             tempest_test_regex: |
+               (?x)    # Ignore comments and whitespaces
+               # Line with only a comment.
+               (tempest\.(api|scenario|thirdparty)).*$    # Run only api scenario and third party
+
 .. zuul:rolevar:: tox_venvlist
    :default: smoke
 
diff --git a/tempest/api/compute/servers/test_server_actions.py b/tempest/api/compute/servers/test_server_actions.py
index e2be249..5c3e9f0 100644
--- a/tempest/api/compute/servers/test_server_actions.py
+++ b/tempest/api/compute/servers/test_server_actions.py
@@ -582,6 +582,12 @@
         compute.shelve_server(self.client, self.server_id,
                               force_shelve_offload=True)
 
+        def _unshelve_server():
+            server_info = self.client.show_server(self.server_id)['server']
+            if 'SHELVED' in server_info['status']:
+                self.client.unshelve_server(self.server_id)
+        self.addOnException(_unshelve_server)
+
         server = self.client.show_server(self.server_id)['server']
         image_name = server['name'] + '-shelved'
         params = {'name': image_name}
diff --git a/tempest/api/compute/servers/test_servers_negative.py b/tempest/api/compute/servers/test_servers_negative.py
index d067bb3..9b545af 100644
--- a/tempest/api/compute/servers/test_servers_negative.py
+++ b/tempest/api/compute/servers/test_servers_negative.py
@@ -477,6 +477,12 @@
         # shelve a shelved server.
         compute.shelve_server(self.client, self.server_id)
 
+        def _unshelve_server():
+            server_info = self.client.show_server(self.server_id)['server']
+            if 'SHELVED' in server_info['status']:
+                self.client.unshelve_server(self.server_id)
+        self.addOnException(_unshelve_server)
+
         server = self.client.show_server(self.server_id)['server']
         image_name = server['name'] + '-shelved'
         params = {'name': image_name}
diff --git a/tempest/api/object_storage/test_container_sync.py b/tempest/api/object_storage/test_container_sync.py
index 042d288..2e979bc 100644
--- a/tempest/api/object_storage/test_container_sync.py
+++ b/tempest/api/object_storage/test_container_sync.py
@@ -33,8 +33,6 @@
 
 
 class ContainerSyncTest(base.BaseObjectTest):
-    clients = {}
-
     credentials = [['operator', CONF.object_storage.operator_role],
                    ['operator_alt', CONF.object_storage.operator_role]]
 
@@ -54,6 +52,7 @@
         super(ContainerSyncTest, cls).resource_setup()
         cls.containers = []
         cls.objects = []
+        cls.clients = {}
 
         # Default container-server config only allows localhost
         cls.local_ip = '127.0.0.1'
diff --git a/tempest/lib/services/network/metering_label_rules_client.py b/tempest/lib/services/network/metering_label_rules_client.py
index 36cf8e3..9542e8f 100644
--- a/tempest/lib/services/network/metering_label_rules_client.py
+++ b/tempest/lib/services/network/metering_label_rules_client.py
@@ -16,6 +16,12 @@
 class MeteringLabelRulesClient(base.BaseNetworkClient):
 
     def create_metering_label_rule(self, **kwargs):
+        """Create metering label rule.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        https://developer.openstack.org/api-ref/network/v2/index.html#create-metering-label-rule
+        """
         uri = '/metering/metering-label-rules'
         post_data = {'metering_label_rule': kwargs}
         return self.create_resource(uri, post_data)
@@ -29,5 +35,11 @@
         return self.delete_resource(uri)
 
     def list_metering_label_rules(self, **filters):
+        """List metering label rules.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        https://developer.openstack.org/api-ref/network/v2/index.html#list-metering-label-rules
+        """
         uri = '/metering/metering-label-rules'
         return self.list_resources(uri, **filters)
diff --git a/tempest/lib/services/network/quotas_client.py b/tempest/lib/services/network/quotas_client.py
index 752b253..fdd3d6b 100644
--- a/tempest/lib/services/network/quotas_client.py
+++ b/tempest/lib/services/network/quotas_client.py
@@ -18,6 +18,12 @@
 class QuotasClient(base.BaseNetworkClient):
 
     def update_quotas(self, tenant_id, **kwargs):
+        """Update quota for a project.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        https://developer.openstack.org/api-ref/network/v2/index.html#update-quota-for-a-project
+        """
         put_body = {'quota': kwargs}
         uri = '/quotas/%s' % tenant_id
         return self.update_resource(uri, put_body)
diff --git a/tempest/lib/services/network/service_providers_client.py b/tempest/lib/services/network/service_providers_client.py
index 0ee9bc3..01313a0 100644
--- a/tempest/lib/services/network/service_providers_client.py
+++ b/tempest/lib/services/network/service_providers_client.py
@@ -16,6 +16,11 @@
 class ServiceProvidersClient(base.BaseNetworkClient):
 
     def list_service_providers(self, **filters):
-        """Lists service providers."""
+        """Lists service providers.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        https://developer.openstack.org/api-ref/network/v2/index.html#list-service-providers
+        """
         uri = '/service-providers'
         return self.list_resources(uri, **filters)
diff --git a/tempest/lib/services/object_storage/account_client.py b/tempest/lib/services/object_storage/account_client.py
index 67f01a6..6b097c1 100644
--- a/tempest/lib/services/object_storage/account_client.py
+++ b/tempest/lib/services/object_storage/account_client.py
@@ -34,7 +34,7 @@
         Account Metadata can be created, updated or deleted based on
         metadata header or value. For detailed info, please refer to the
         official API reference:
-        http://developer.openstack.org/api-ref/object-storage/?expanded=create-update-or-delete-account-metadata-detail
+        https://developer.openstack.org/api-ref/object-store/#create-update-or-delete-account-metadata
         """
         headers = {}
         if create_update_metadata:
diff --git a/tempest/lib/services/object_storage/container_client.py b/tempest/lib/services/object_storage/container_client.py
index 2da8e24..430e0d4 100644
--- a/tempest/lib/services/object_storage/container_client.py
+++ b/tempest/lib/services/object_storage/container_client.py
@@ -97,7 +97,7 @@
 
         For a full list of available parameters, please refer to the official
         API reference:
-        https://developer.openstack.org/api-ref/object-storage/?expanded=show-container-details-and-list-objects-detail
+        https://developer.openstack.org/api-ref/object-store/#show-container-details-and-list-objects
         """
 
         url = str(container_name)