[gnome-session] (7 commits) Non-fast-forward update to branch wip/laney/systemd-user-switch

[Iain Lane <iainl src gnome org>]

The branch 'wip/laney/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:

  bcdaa27... gsm-systemd: Find user's graphical session, not the current
  cac9b6f... When there are no required apps (under systemd), let Setenv
  c544a20... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta
  7e4f401... Allow RequiredComponents to be skipped
  2fe566e... Add a gnome-session-systemd binary to launch the session
  62eb131... Add systemd user units
  b7e8df6... Launch sessions with systemd --user.

Commits added to the branch:

  29bb29e... gsm-systemd: Find user's graphical session, not the current (*)
  8ce6902... When there are no required apps (under systemd), let Setenv (*)
  0e6b338... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta (*)
  23e38aa... Allow RequiredComponents to be skipped (*)
  c0d43dc... Add a gnome-session-systemd binary to launch the session (*)
  7f4fa89... Add systemd user units (*)
  c0de6d7... Launch sessions with systemd --user.

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