Instead of publishing A/AAAA records for $(hostname).loocal with a CNAME
infix.local, we flip it around to take advantage of the mDNS conflict
resolution rules. This gives us infix.local for one device ont the LAN
and infix-2.local for the next.
Update all service records to *not* advertise hostname, but instead to
let Avahi imply that from the advertised A/AAAA and CNAME records.
Fixes#1387
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>