'Handle Connection.Unblocked notification from RabbitMQ broker
:param callable user_callback: callback_method passed to
`add_on_connection_unblocked_callback`
:param pika.frame.Method method_frame: method frame having `method`
member of type `pika.spec.Connection.Blocked`'

def _on_connection_unblocked(self, user_callback, method_frame):

    self._ready_events.append(_ConnectionUnblockedEvt(user_callback, method_frame))
