[REFACTOR] moved VersionManager class

This class is definitely NOT an UTIL class. Moved it out of the util
package.

Change-Id: Idddee2d4eb9f599d71577739c4ed89231537b3b4
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1267
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>