[INTERNAL] removed SkipSync Feature artifacts

This feature was disabled long ago for a good reason.
The options to enable this feature still exist in "Debug Mode" but
does not do anything anymore.

Change-Id: I46c7856ddd6537bca5a9a2121da413f5a5648382
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1405
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>