[UIFe] Show a warning when shutting down and users are logged in

[Andrea Azzarone]

Hey all,

I'm proposing to submit the following UIFe for Unity:

https://bugs.launchpad.net/unity/+bug/1281058

It adds a warning in the session dialog when shutting down and users are
logged in. It uses the same string of gnome-screensaver.

Thanks!

-- 
Andrea Azzarone
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