[Pkg-utopia-maintainers] Bug#852256: #661591 for avahi-autoipd

[Christian Hofstaedtler]

The hook installed by avahi-autoipd unconditionally runs
avahi-autoipd -k when dhclient assigns an IP. When the interface was
not configured beforehand, no daemon is running, and the -k
invocation will cause an exit code of 1.
This in turn causes ifup to exit with 1, and the interface will end
up in a half-configured state, and the ifup at .service service will
show an error state.

-ch