[Merge] ~azzar1/unity:fix-1733557 into unity:master

[Andrea Azzarone]

Andrea Azzarone has proposed merging ~azzar1/unity:fix-1733557 into unity:master.

Commit message:
locksreen: cancel authentication if externally unlocked

    The lockscreen can be externellay unlocked. This happens e.g. when
    you unlock the session from LightDM or from the CLI. We need to
    cancel the authentication in order to ensure that the next one does
    not fail.

    Fixes: https://bugs.launchpad.net/unity/+bug/1733557

Requested reviews:
  Unity Team (unity-team)

For more details, see:
https://code.launchpad.net/~azzar1/unity/+git/unity/+merge/363124
-- 
Your team Unity Team is requested to review the proposed merge of ~azzar1/unity:fix-1733557 into unity:master.
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