We need to disable it by default in resolved so that it doesn't fight
with avahi for the port when both are started up in parallel.
I also moved nss-files before nss-resolve. This is unfortunate because
resolved cached files and with the move, the file will be re-read on each
query. Nevertheless, we want nss-files to have higher priority than nss-mdns
to honour local config. Fortunately, only some people put lots of entries
in /etc/hosts, so the inefficiency incurred by this isn't important for
most users.
nss-myhostname is moved after nss-files, following the change in
upstream recommendations.
5a70c03b7f