[TASK] Unify table of groups to be imported

Change-Id: I5321e0061f9598c86e6f7a3bf167270918d494db
Reviewed-on: http://review.typo3.org/32163
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>