Add minimal support for the v2 API

This only allows you to run image-list, but sets up a framework
that we can use to fill in the rest of the v2 functionality.

* Related to bp glance-client-v2

Change-Id: I8827e36fdcf79fe402990a6d05898ec00cbd54c6

glanceclient/client.py

@@ -0,0 +1,22 @@
+# Copyright 2012 OpenStack LLC.
+# 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 glanceclient.common import utils
+
+
+def Client(version, *args, **kwargs):
+    module = utils.import_versioned_module(version, 'client')
+    client_class = getattr(module, 'Client')
+    return client_class(*args, **kwargs)