Backport fixes from upstream post v4.16 release. Mainly to fix
mdns-alias crash+restart counter issue when avahi-daemon has to
be restarted. Finit did not properly clear the dependency that
mdns-alias had on avahi-daemon, causing it to crash and have its
restart counter incremented.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>