D13998: [Logout Greeter] Remove KDM cruft

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  `KDisplayManager::bootOptions` only worked with "`NewKDM`" but KDM is obsolete in Plasma 5. Creating an instance of `KDisplayManager` does DBus stuff to find out the DM being used.
  Also, `kdmrc` is dead and this code always returned `None` anyway.

TEST PLAN
  Saves almost 2ms greeter startup time for me
  No QML undefined warnings and greeter still works fine

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D13998

AFFECTED FILES
  ksmserver/logout-greeter/shutdowndlg.cpp

To: broulik, #plasma, davidedmundson
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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