[REFACTOR] Added dummy VCSProvider implementation to core package

And removed the outdated one.

Change-Id: I1f93029bf5b56505b2b10e9a368c68d8135ea132
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1814
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>
Tested-by: Jenkins CI