resolved: allow access to Set*Link and Revert methods through polkit

resolved: allow access to Set*Link and Revert methods through polkit

This matches what is done in networkd very closely. In fact even the
policy descriptions are all identical (with s/network/resolve), except
for the last one:
resolved has org.freedesktop.resolve1.revert while
networkd has org.freedesktop.network1.revert-ntp and
org.freedesktop.network1.revert-dns so the description is a bit different.

Conflicts:
	src/resolve/resolved-bus.c
	src/resolve/resolved-link-bus.c

Related: #1746857