Fix Designate Zone ID lookup for real

When there are no 'supported_versions' defined for a client plugin,
we should not use version when calling self.client()

Also fixes similar issue in resources.

Task: 38165

Change-Id: Ifce776e8e8375f6a4399574aa71cc2f81ecc57b0

heat/engine/clients/os/designate.py

@@ -39,7 +39,7 @@ class DesignateClientPlugin(client_plugin.ClientPlugin):
         return isinstance(ex, exceptions.NotFound)
 
     def get_zone_id(self, zone_id_or_name):
-        client = self.client(version='2')
+        client = self.client()
         try:
             zone_obj = client.zones.get(zone_id_or_name)
             return zone_obj['id']

heat/engine/resources/openstack/designate/recordset.py

@@ -98,10 +98,6 @@ class DesignateRecordSet(resource.Resource):
 
     entity = 'recordsets'
 
-    def client(self):
-        return super(DesignateRecordSet,
-                     self).client(version=self.client_plugin().V2)
-
     def handle_create(self):
         args = dict((k, v) for k, v in six.iteritems(self.properties) if v)
         args['type_'] = args.pop(self.TYPE)

heat/engine/resources/openstack/designate/zone.py

@@ -105,10 +105,6 @@ class DesignateZone(resource.Resource):
 
     entity = 'zones'
 
-    def client(self):
-        return super(DesignateZone,
-                     self).client(version=self.client_plugin().V2)
-
     def validate(self):
         super(DesignateZone, self).validate()