Alternative mdns dns-sd responder

[tkurki]

We are currently using mdns as the default mdns responder, falling back to dnssd2 in case mdns installation fails.

Neither of these have been without problems. If nothing else mdns throws up a bunch of confusing warnings on startup, raising doubts about everything being ok and causing support requests.

Homebridge appears to have a modern, pure js responder implementation that might prove useful https://github.com/homebridge/ciao

[sbender9]

I gave this a try, but there's an issue and not getting any response from them.

homebridge/ciao#20