[REFACTOR] extracted start and stop user logic.

Moved the logic from the createProjectArchives method
into two separate methods.

Change-Id: I5f5d9f46eabc657b467d01c9899103eb07c1d305
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/922
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>