D24287: cleanup dbus related objects early enough to avoid hang on program exit

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R288 KJobWidgets

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24287

To: cullmann, dfaure, kfunk
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns