enable cinder v2 api for test_volumes_backup

Partially implements: blueprint cinder-v2-api-tests

Change-Id: Ib091928b3f6ed8ffd54b0a8e35f167a8ceb52560
diff --git a/tempest/services/volume/v2/json/backups_client.py b/tempest/services/volume/v2/json/backups_client.py
new file mode 100644
index 0000000..9698075
--- /dev/null
+++ b/tempest/services/volume/v2/json/backups_client.py
@@ -0,0 +1,26 @@
+# Copyright 2014 OpenStack Foundation
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from tempest.services.volume.json import backups_client
+
+
+class BackupsClientV2JSON(backups_client.BaseBackupsClientJSON):
+    """
+    Client class to send CRUD Volume V2 API requests to a Cinder endpoint
+    """
+
+    def __init__(self, auth_provider):
+        super(BackupsClientV2JSON, self).__init__(auth_provider)
+        self.api_version = "v2"