acd/tests: skip test if nm_acd_manager_start_probe() fails with EPERM

and assert that nm_acd_manager_announce_addresses() succeeds (but also
ignore failure with EPERM).
4 jobs for <span class="ref-name">th/gitlab-ci-fixes</span> in 22 minutes and 12 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
canceled #213014
build_f28

00:22:11

passed #213015
build_f_latest

00:18:08

canceled #213016
allowed to fail
build_f_rawhide

00:22:11

passed #213013
allowed to fail
checkpatch

00:09:24