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

[Andrea Azzarone]

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

Commit message:
lockscreen: 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/363310
-- 
Your team Unity Team is requested to review the proposed merge of ~azzar1/unity:fix-1733557-bionic into unity:bionic.
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