Delete some dead code from client model

Didn't notice that we have duplicated methods in the client models until
I started working on some test cases.

Change-Id: I79875fdda5e14c4d08e9628b51aeffaff9491bc7

senlinclient/v1/models.py

@@ -11,7 +11,6 @@
 # under the License.
 
 from openstack import utils
-
 from senlinclient.common import sdk as resource
 from senlinclient.openstack.clustering import clustering_service
 
@@ -299,46 +298,6 @@ class Cluster(resource.Resource):
         }
         return self.action(session, body)
 
-    def attach_policy(self, session, policy_id, priority, level, enabled,
-                      cooldown):
-        body = {
-            'attach_policy': {
-                'policy_id': policy_id,
-                'priority': priority,
-                'level': level,
-                'enabled': enabled,
-                'cooldown': cooldown,
-            }
-        }
-        return self.action(session, body)
-
-    def detach_policy(self, session, policy_id):
-        body = {
-            'detach_policy': {
-                'policy_id': policy_id,
-            }
-        }
-        return self.action(session, body)
-
-    def enable_policy(self, session, policy_id, priority, level, cooldown):
-        body = {
-            'attach_policy': {
-                'policy_id': policy_id,
-                'priority': priority,
-                'level': level,
-                'cooldown': cooldown,
-            }
-        }
-        return self.action(session, body)
-
-    def disable_policy(self, session, policy_id):
-        body = {
-            'disable_policy': {
-                'policy_id': policy_id,
-            }
-        }
-        return self.action(session, body)
-
     def resize(self, session, adjustment_type=None, number=None,
                min_size=None, max_size=None, min_step=None, strict=False):
         body = {