Test suite cleanups and improvements
Newer phoc prompted for better DBus isolation so lets finally use g_test_dbus consistently and remove some duplication. This is needed for !904 (merged) as we want the newer phoc in the test there.
We pull in the test/ci related bits from !1228 (merged)
As a bonus this allows us finally to run all tests in parallel, saving CI time.
Closes: #671 (closed)
Edited by Guido Günther