code: def delete_lbaas_port(self, lb_id):
          
          lb_id = lb_id.replace('-', '')
          req = dict(instance_id=lb_id)
          instances = self.get_vms_for_this_req(**req)
          for vm in instances:
              LOG.info("deleting lbaas vm %s " % vm.name)
              self.delete_vm_function(vm.port_id, vm)
docs: send vm down event and delete db.
  
          :param lb_id: vip id for v1 and lbaas_id for v2