Adding backup resource to quota command

Adding handle for error 422

Change-Id: I4c60984ec7196f346da99769f21f7372a35b3f86

reddwarfclient/client.py

@@ -184,7 +184,7 @@ class ReddwarfHTTPClient(httplib2.Http):
         else:
             body = None
 
-        if resp.status in (400, 401, 403, 404, 408, 409, 413, 500, 501):
+        if resp.status in (400, 401, 403, 404, 408, 409, 413, 422, 500, 501):
             raise exceptions.from_response(resp, body)
 
         return resp, body

reddwarfclient/mcli.py

@@ -71,7 +71,8 @@ class QuotaCommands(common.AuthedCommandsBase):
 
     params = ['id',
               'instances',
-              'volumes']
+              'volumes',
+              'backups']
 
     def list(self):
         """List all quotas for a tenant"""