tplink-connection leaks promises in Queue object

[jimrushPersonal]

this.on('timeout', () => {
  this.log.debug(
    `TplinkConnection(${this.description}): timeout()`,
    this.host,
    this.port
  );
  this.queue.add(async () => {
    this.close();
  });
});

The promise is never triggered. So, after every timeout, a promise will be leaked in the Queue object. Note, the current close function only performs a log statement, so the actual need for a promise in the current codebase.

I discovered this on a device that I think has a dubious network connection (HS300PowerStrip) and numerous children. I did see a couple of tplink-connection objects in memory tied to that IP address, but that may have just been for the children.