[Merge] lp:~azzar1/unity/fix-missing-entry-lockscreen into lp:unity

[Andrea Azzarone]

Andrea Azzarone has proposed merging lp:~azzar1/unity/fix-missing-entry-lockscreen into lp:unity.

Commit message:
Refactor the way UserAuthenticator is created and passed around. Handle failures to create new threads and fallback to a "Switch to greeter..." button in case of failure.

Requested reviews:
  Unity Team (unity-team)
Related bugs:
  Bug #1311316 in Unity: "After locking screen there is no input field to type password for unlock"
  https://bugs.launchpad.net/unity/+bug/1311316

For more details, see:
https://code.launchpad.net/~azzar1/unity/fix-missing-entry-lockscreen/+merge/330801
-- 
Your team Unity Team is requested to review the proposed merge of lp:~azzar1/unity/fix-missing-entry-lockscreen into lp:unity.
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