Avoid logging graceful disconnect as error

[elupus]

The chromecasts restart each night, and seem to
generally do this by doing a socket shutdown of
write leading to a EOF received by clients.

No need to log this as an error

[elupus]

Next step would be to add some backoff on reconnect. Not verified this, but if they behave correctly (which I suspect they do) they remove their mdns entry either before or more likely after they disconnect.

So we should hit the mdns backoff if we delay just a little. But not fully sure how to add that delay.

[elupus]

Hmm. I wonder should we set stop()? Will something restart the thread again when a service is spotted?