[gnome-session] (19 commits) Non-fast-forward update to branch wip/benzea/systemd-user-switch

[Benjamin Berg <bberg src gnome org>]

The branch 'wip/benzea/systemd-user-switch' 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:

  dcdb763... gsm-systemd: Find user's graphical session, not the current
  53841a8... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta
  8a7f4eb... autostart-app: Add X-GNOME-Autostart-systemd for hiding
  aaef6e4... fail-whale: Never show logout button in GDM
  bf9a86e... manager: Integrate with systemd startup notification
  c95718e... util: Add API to start a systemd unit
  95dc8ba... manager: Add systemd-managed property
  110237b... manager: Allow fetching the configured session without mana
  e5f4a7b... manager: Add initilization synchronization point DBus API
  543ae0d... main: Add systemd gnome-session monitoring code for leader
  e215424... gnome-session-ctl: Add helper binary for systemd targets
  f581b32... data: Add systemd user units
  45011b3... manager: Quit session manager after completing shutdown
  560b10a... main: Enable systemd usage
  5713e7e... manager: Drop DBus restart as it is handled using systemd
  a172f9c... system: Remove is_last_session API as it is unused
  1a938b9... main: Export autostart dir into environment

Commits added to the branch:

  6a89b57... Update Chinese (China) translation (*)
  e1a011e... gsm-systemd: Find user's graphical session, not the current
  692b99e... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta
  8d56900... autostart-app: Add X-GNOME-Autostart-systemd for hiding
  f1bfb9e... fail-whale: Never show logout button in GDM
  13ce0db... meson: Add compile time option to control systemd session m
  6882a6e... manager: Integrate with systemd startup notification
  48b57f4... util: Add API to start a systemd unit
  3b415c4... manager: Add systemd-managed property
  00c790b... manager: Allow fetching the configured session without mana
  630ac14... manager: Add initilization synchronization point DBus API
  83aebf1... main: Add systemd gnome-session monitoring code for leader
  b088aee... gnome-session-ctl: Add helper binary for systemd targets
  0ac04a7... data: Add systemd user units
  6d5b59d... manager: Quit session manager after completing shutdown
  dc141b5... manager: Rely on systemd restarting DBus already
  c051e6b... main: Export autostart dir into environment
  9723b28... main: Enable systemd usage
  b9a9873... shell-extensions: Touch login warning file when disabling e

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