@Override
    public void initWriteBufferWaterMark(int low, int high) {
        option(BoltServerOption.NETTY_BUFFER_LOW_WATER_MARK, low);
        option(BoltServerOption.NETTY_BUFFER_HIGH_WATER_MARK, high);
    }
override the random port zero with the actual binding port value.
@param port local binding port
src/main/java/com/alipay/remoting/AbstractRemotingServer.java