[gdm] (9 commits) Created branch wip/multi-stack

[Ray Strode <halfline src gnome org>]

The branch 'wip/multi-stack' was created.

Summary of new commits:

  e02072a... daemon: Make current pam conversation explicit throughout c
  10c04b3... daemon: Rename session worker to the service it's managing
  7cdc6e8... daemon,greeter: Make greeter/autologin session initiate PAM
  1ae3e3d... daemon: Store multiple conversations in the session
  d4b47ac... daemon: Distinguish "pam module failed" from "authenticatio
  15f5eba... greeter: drop is-interactive stuff
  e93ce1b... greeter: Add a plugin based extension system to greeter
  20a67a6... greeter: Add fingerprint plugin
  87239a4... greeter: Add smartcard plugin