[Merge] ~andrew.sh/unity:fix-auth-failure-lp1733557 into unity:master

[Andrej Shadura]

Andrej Shadura has proposed merging ~andrew.sh/unity:fix-auth-failure-lp1733557 into unity:master.

Requested reviews:
  Unity Team (unity-team)

For more details, see:
https://code.launchpad.net/~andrew.sh/unity/+git/unity/+merge/362414

This change fixes the regression introduced in 44e6022, which causes the lock screen to start failing when session switching is involved.

I have tested the change on my machine with two logged in users; the session running the build with the change proposed was working normally, while the session running unpatched Unity would fail after a few session switches.

LP: #1733557
-- 
Your team Unity Team is requested to review the proposed merge of ~andrew.sh/unity:fix-auth-failure-lp1733557 into unity:master.
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