Add filter "is_enabled" for policy binding list

Revise the help information:
add "is_enabled", delete "type" and "name"

Depends-On: Ic197bee5efd7a620365ed87c6a141e1b7a3960c1

Change-Id: I459eb0168ea09010c599f4d4df619186ff54be36

senlinclient/v1/cluster_policy.py

@@ -34,7 +34,7 @@ class ClusterPolicyList(command.Lister):
             help=_("Filter parameters to apply on returned results. "
                    "This can be specified multiple times, or once with "
                    "parameters separated by a semicolon. The valid filter "
-                   "keys are: ['type', 'name']"),
+                   "keys are: ['is_enabled']"),
             action='append'
         )
         parser.add_argument(