world: Add python-dbusmock

As used in a number of different test suites across the GNOME ecosystem
(including GLib and gnome-settings-daemon).
4 jobs for master in 12 minutes and 55 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed test-py3 #1407177

00:03:28

passed ub20.04-py3-glib #1407182

00:12:54

 
  Deploy
passed pages #1407186

00:00:36

passed pages:deploy

00:00:00