code: AmqpClient tuneOkConnection(int channelMax, int frameMax, int heartbeat) {
          this.tuneOkConnection(channelMax, frameMax, heartbeat, null, null);
          return this;
      }
docs: Sends a TuneOkConnection to server.
  
  @param channelMax
  @param frameMax
  @param heartbeat
  @return AmqpClient