[INTERNAL] replaced Eclipse Monitor usage in IPN

TODO: The VCS stuff still requires Eclipse Monitors.

Change-Id: Ia2516ca6b6f892057b76860764fca58b27b9f0df
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1922
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>