[gdm] (5 commits) Non-fast-forward update to branch wip/two

[Jasper St. Pierre <jstpierre src gnome org>]

The branch 'wip/two' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  05a32c1... session-worker-job: Log the session worker to the journal
  5ed5fd2... Integrate the slaves into the main daemon process
  07a017b... display: Enforce a few invariants
  4bd4a4f... display: Remove some unnecessary parts from dispose
  850faf0... display: Clean up old signal handlers

Commits added to the branch:

  e4c02bb... session-worker-job: Log the session worker to the journal
  93476f4... Integrate the slaves into the main daemon process
  6464d16... display: Enforce a few invariants
  f0e6bbd... display: Remove some unnecessary parts from dispose
  4f24266... display: Clean up old signal handlers