Register client and add first test

Add first API test and register the client with
the new tempest.lib client interface.

Change-Id: I27f15375c46faa48cd56c8d52ecfd585fb325239
Implements: bp tempest-plugin
diff --git a/barbican_tempest_plugin/clients.py b/barbican_tempest_plugin/clients.py
new file mode 100644
index 0000000..078f383
--- /dev/null
+++ b/barbican_tempest_plugin/clients.py
@@ -0,0 +1,32 @@
+# Copyright (c) 2016 SAP SE
+#
+# 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 import config
+from tempest.lib.services import clients
+
+
+CONF = config.CONF
+
+
+class Clients(clients.ServiceClients):
+    """Tempest stable service clients and loaded plugins service clients"""
+
+    def __init__(self, credentials, service=None):
+        """Emulate the interface of Tempest's clients.Manager"""
+        # Identity settings
+        if CONF.identity.auth_version == 'v2':
+            identity_uri = CONF.identity.uri
+        else:
+            identity_uri = CONF.identity.uri_v3
+        super(Clients, self).__init__(credentials, identity_uri)