Set TTL of unicast (replies) to 255, like Apple's mDNSResponder
Set TTL of unicast (replies) to 255, like Apple's mDNSResponder

Also, add more comments to this criticial function and a warning if we
fail to set the outbound IP_MULTICAST_IF.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/mdnsd,troglobit/mdnsd