[gdm] Created tag 3.18.3

[Tim Lunn <timl src gnome org>]

The unsigned tag '3.18.3' was created.

Tagger: Tim Lunn <tim feathertop org>
Date: Thu Apr 14 16:12:30 2016 +1000

    - Get rid of "custom" session
    - Use -listen instead of -nolisten for new Xorg
    - Don't override PAM message for password change
    - ensure unlock screen gets told when verification completes
    - Fix log output
    - Fix timed login
    - Fix passwordless logins on Debian/Ubuntu
    - Don't allow passwordless XDMCP logins

Changes since the last tag '3.18.2':

Michael Catanzaro (1):
      session-worker: Don't override prompt from PAM when setting new password

Nathaniel Roach (1):
      Use -listen instead of -nolisten for new Xorg

Ray Strode (7):
      xdmcp-display: this shouldn't be an abstract type
      Xsession: get rid of "custom" session
      gdm-session: emit verification-complete even for logins
      session: keep session object alive while establishing credentials
      session: free conversation hash when disposing session
      gdm-{x,wayland}-session: add newlines to g_printerr
      manager: make sure timed login conversation is started

Tim Lunn (4):
      gdm-session: set PAM_TTY when initialising pam
      gdm-session: require a password for for remote logins
      NEWS: update for release
      configure: bump to 3.18.3