[gdm] (20 commits) Non-fast-forward update to branch wip/wayland-rebase

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

The branch 'wip/wayland-rebase' 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:

  33bfad8... utils: move login screen jumping code to common
  827514a... flexiserver: don't open a display
  ce129cd... worker: move PAM tty/display setup to open session
  4499416... daemon: add new gdm_session_is_running method
  406c17c... daemon: rename gdm-slave-proxy to gdm-slave-job
  82ad23a... daemon: rename slave_bus_proxy to slave_proxy
  3f2aa88... daemon: move user session code from slave to main daemon
  61b3acc... slave: add ability to reset launch environment
  dcce0d0... daemon: support launching sessions on separate VT

Commits added to the branch:

  e0e9ca7... slave: fail gracefully when fed an invalid display id (*)
  fdc2668... slave: check object path validity before creating proxy fro (*)
  51572ce... updated kn.po (*)
  72716d3... display: fix memory leak if AddUserAuthentication called mo (*)
  e838668... display: Remove dummy manage implementation
  6cfbc92... xdmcp-chooser-slave: Don't fetch the display_id
  df5bc25... display: Remove gdm_display_get_bus_connection
  b29deda... xdmcp-display: Remove dummy skeleton
  fc66378... flexiserver: Remove a dead branch
  989d64d... daemon: rename gdm-slave-proxy to gdm-slave-job
  08554c6... utils: move login screen jumping code to common
  d0a37cf... flexiserver: don't open a display
  4a30044... daemon: rename slave_bus_proxy to slave_proxy
  2894def... worker: move PAM tty/display setup to open session
  4af0321... daemon: add new gdm_session_is_running method
  e804a28... daemon: move user session code from slave to main daemon
  af7a2aa... slave: add ability to reset launch environment
  869774a... daemon: support launching sessions on separate VT
  4f2a412... slave: Make all the "cached display" properties readonly
  5a3c1f9... destroy slave

(*) This commit already existed in another branch; no separate mail sent