docs: def delete(self, port, qos_policy=None):
          """Remove QoS rules from port.
  
          :param port: port object.
          :param qos_policy: the QoS policy to be removed from port.
          """
          LOG.info("Deleting QoS policy %(qos_policy)s on port %(port)s",
                   dict(qos_policy=qos_policy, port=port))
  
          self._utils.remove_port_qos_rule(port["port_id"])