[gdm] (74 commits) Non-fast-forward update to branch wip/laney/systemd-user

[Iain Lane <iainl src gnome org>]

The branch 'wip/laney/systemd-user' 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:

  3c442c2... manager: Find user's current graphical session, not session

Commits added to the branch:

  d31c235... NEWS: update for release (*)
  87c5edd... configure: bump to 3.27.3 (*)
  e9e60e2... Replace deprecated GSimpleAsyncResult with GTask (*)
  04bed0a... Update Friulian translation (*)
  b084c3d... Updated Spanish translation (*)
  8860b5f... Update Turkish translation (*)
  84b921c... Update Swedish translation (*)
  932ba7a... Update German translation (*)
  5dd7f5d... Updated Czech translation (*)
  bcd60d7... Updated Slovenian translation (*)
  5dd631c... common: don't run scripts with bogus DISPLAY and XAUTHORITY (*)
  bf0a664... common: Also set GROUP in scripts (*)
  250dd69... pam_gdm: bail if more than one password (*)
  5ae4d17... NEWS: update for release (*)
  d903a4a... configure.ac: bump to 3.27.4 (*)
  a007261... Update Finnish translation (*)
  e7fdf18... Remove unused variables (*)
  67ab996... Update Hungarian translation (*)
  3ec8296... [l10n] Update Catalan translation (*)
  fa6b597... Fixes to Catalan translation (*)
  96de271... Update Polish translation (*)
  63f84ea... Update Galician translation (*)
  20b891d... Update Estonian translation (*)
  33901c7... gnome-login: Adjust to g-s-d's plugin removals (*)
  17a9f38... Update Brazilian Portuguese translation (*)
  081f293... common: Support runtime configurations (*)
  f15e645... data: Add udev rules to disable Wayland on Cirrus (*)
  ce2ef87... Remove obsolete references to XNEST from the build system (*)
  5926f23... gdm-{wayland,x}-session: fix segfault if run with no argume (*)
  12e1586... NEWS: update for release (*)
  098b652... configure: bump to 3.27.90 (*)
  1439066... Update Croatian translation (*)
  f4f7b69... Revert "session: don't call gdm_session_defaults_changed fr (*)
  80d0503... NEWS: update for release (*)
  c2be5b2... configure: bump to 3.27.91 (*)
  fbdaf85... Update Dutch translation (*)
  92cbbb9... Update Serbian translation (*)
  9e533fe... Update Serbian Latin translation (*)
  b813bd4... Fix Spanish translation header (*)
  41e90e2... Update Kazakh translation (*)
  d7f4802... Update Chinese (Taiwan) translation (*)
  e8117a8... Update Latvian translation (*)
  fd34677... Update Korean translation (*)
  fd20abb... Update Italian translation (*)
  b722808... Update Scottish Gaelic translation (*)
  1e36e8d... libgdm: "Fix" a memory leak (*)
  cb56eae... Updated Vietnamese translation (*)
  1129228... Updated Lithuanian translation (*)
  2161e2d... Update French translation (*)
  c868e63... Update Romanian translation (*)
  cfde4dd... Update Greek translation (*)
  05abe89... Updated Punjabi Translation (*)
  3c892fc... NEWS: update for 3.27.92 (*)
  d399e34... configure: bump to 3.27.92 (*)
  bb2e376... Updated Danish translation (*)
  0f201ef... Update Icelandic translation (*)
  11fe5d8... Update Russian translation (*)
  fc093d9... NEWS: update for release (*)
  a510c61... configure: update to 3.28.0 (*)
  29397c2... Update Slovak translation (*)
  9c85139... Update Chinese (Taiwan) translation (*)
  ef9977b... daemon/gdm-manager.c: quit plymouth when xdmcp is the only  (*)
  d8a9daf... daemon: Don't call g_option_context_set_ignore_unknown_opti (*)
  f372123... launch-environment: Order optional environment vertically (*)
  6e74335... launch-environment: Set PATH via optional_environment (*)
  85184f7... launch-environment: Export library and gio paths (*)
  a9337f5... manager: Find user's current graphical session, not session
  67e36b1... Pass the autostart directory via the environment
  a9d1e17... Don't pass --debug for now
  3c38058... manager: When falling back to looking up session by pid, lo
  1add2d7... manager: Look for a greeter session if we can't find a disp
  4ef04db... Start gnome-session-systemd
  4b009d5... Start gnome-login-wayland.target under wayland sessions
  b0fa414... Detect if we're running under systemd --user and fall back 

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