code: def routers_removed_from_hosting_device(self, context, router_ids,
                                              hosting_device):
          
          self._agent_notification_bulk(
              context, 'router_removed_from_hosting_device', router_ids,
              hosting_device, operation=None)
docs: Notify cfg agent that routers have been removed from hosting device.
          @param: context - information about tenant, user etc
          @param: router-ids - list of ids
          @param: hosting_device - device hosting the routers