The new units mirror the upstream systemd units as closely as possible.
I could not find a reason why the service would need to be restarted on
resuming from suspend, and the upstream units also do not contain such a
restriction, so I removed the `partOf = [ "post-resume.target"]`.
This fixes #19525.
See #18319 for details. Starting network-online.target manually does not
work as it hangs indefinitely.
Additionally, don't treat avahi and dhcpcd special and sync their systemd units
with the respective upstream suggestion.
Add new option declarations to control what information is published
by the avahi daemon. The default values are chosen to respect the
privacy of the user over the connectivity of the system.
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
