[gdm] (9 commits) Created branch wip/rstrode/wayland-filtering

[Ray Strode <halfline src gnome org>]

The branch 'wip/rstrode/wayland-filtering' was created.

Summary of new commits:

  0d6735f... xdmcp-display: this shouldn't be an abstract type
  3ebe9dd... Xsession: get rid of "custom" session
  dd72cd8... local-display-factory: drop obsolete FIXME
  8d97e91... local-display-factory: don't sweat hardcoding seat0 for tra
  f6f531c... libgdm: refactor session list handling code
  4e10c13... libgdm: filter out wayland sessions from X11 login screen
  b3c177c... session: route GdmSession "self" object into some functions
  2607b32... session: add property for ignoring wayland sessions
  04d3b5a... manager: filter out wayland user sessions if X11 login scre