D6004: Add method to unlock greeter via consolekit.

[Tobias C. Berner]

tcberner added a subscriber: erichameleers.

REPOSITORY
  R133 KScreenLocker

REVISION DETAIL
  https://phabricator.kde.org/D6004

To: tcberner, #freebsd, graesslin, #plasma
Cc: erichameleers, plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, 
ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas