Change resource_types action

Change resource_types action for purge so that when developer use
the zaqar client lib, the parameter 'resource_types' can be passed
in an array instead of a string. It makes more sense and be
consistent with the API.

Change-Id: Idbf514d76219548c0dbfbcf96fe931c681276443

zaqarclient/queues/v2/cli.py

@@ -72,6 +72,7 @@ class PurgeQueue(command.Command):
         parser.add_argument(
             "--resource_types",
             metavar="<resource_types>",
+            action='append',
             choices=['messages', 'subscriptions'],
             help="Resource types want to be purged.")
         return parser

zaqarclient/queues/v2/core.py

@@ -103,7 +103,7 @@ def queue_purge(transport, request, name, resource_types=None):
     request.operation = 'queue_purge'
     request.params['queue_name'] = name
     if resource_types:
-        request.content = json.dumps({'resource_types': [resource_types]})
+        request.content = json.dumps({'resource_types': resource_types})
 
     resp = transport.send(request)
     return resp.deserialized_content

zaqarclient/tests/queues/queues.py

@@ -579,7 +579,7 @@ class QueuesV2QueueUnitTest(QueuesV1_1QueueUnitTest):
             send_method.return_value = resp
 
             self.queue.purge(resource_types=['messages'])
-            self.assertEqual({"resource_types": [["messages"]]},
+            self.assertEqual({"resource_types": ["messages"]},
                              json.loads(send_method.call_args[0][0].content))