Create functional test base

This will allow adding 'check-glanceclient-dsvm-functional' tests in
the gate, similar to:

 * check-novaclient-dsvm-functional
 * check-keystoneclient-dsvm-functional
 * check-neutronclient-dsvm-functional
 * etc

Change-Id: Id970db52695db7dc53206aa05fe573995b57aa78

glanceclient/tests/functional/base.py

@@ -0,0 +1,44 @@
+#    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.
+
+import os
+
+from tempest_lib.cli import base
+
+
+class ClientTestBase(base.ClientTestBase):
+    """
+    This is a first pass at a simple read only python-glanceclient test. This
+    only exercises client commands that are read only.
+
+    This should test commands:
+    * as a regular user
+    * as an admin user
+    * with and without optional parameters
+    * initially just check return codes, and later test command outputs
+
+    """
+    def _get_clients(self):
+        cli_dir = os.environ.get(
+            'OS_GLANCECLIENT_EXEC_DIR',
+            os.path.join(os.path.abspath('.'), '.tox/functional/bin'))
+
+        return base.CLIClient(
+            username=os.environ.get('OS_USERNAME'),
+            password=os.environ.get('OS_PASSWORD'),
+            tenant_name=os.environ.get('OS_TENANT_NAME'),
+            uri=os.environ.get('OS_AUTH_URL'),
+            cli_dir=cli_dir)
+
+    def glance(self, *args, **kwargs):
+        return self.clients.glance(*args,
+                                   **kwargs)