Remove get_service_by_instance

k8s is a logic concept and it does not bind to any instance

Change-Id: I4bfb1940c681a133d6a5257c3abe2a8661fca67b

magnum/db/api.py

@@ -664,14 +664,6 @@ class Connection(object):
         :returns: A service.
         """
 
-    @abc.abstractmethod
-    def get_service_by_instance(self, instance):
-        """Return a service.
-
-        :param instance: The instance name or uuid to search for.
-        :returns: A service.
-        """
-
     @abc.abstractmethod
     def destroy_service(self, service_id):
         """Destroy a service and all associated interfaces.

magnum/db/sqlalchemy/api.py

@@ -1120,20 +1120,6 @@ class Connection(api.Connection):
         except NoResultFound:
             raise exception.ServiceNotFound(bay=bay_uuid)
 
-    def get_service_by_instance(self, instance):
-        if not utils.is_uuid_like(instance):
-            raise exception.InvalidUUID(uuid=instance)
-
-        query = (model_query(models.Service)
-                 .filter_by(instance_uuid=instance))
-
-        try:
-            result = query.one()
-        except NoResultFound:
-            raise exception.InstanceNotFound(instance=instance)
-
-        return result
-
     def destroy_service(self, service_id):
         session = get_session()
         with session.begin():