Don't let AFT set unsupported groups

E.g.: dewiki is a wiki without rollbacker group, but on
https://de.wikipedia.org/wiki/Spezial:Gruppenrechte
a group rollbacker with aftv5 rights exist, which is not needed
and confusing.

Change-Id: I95328bd615aaca9cd1adb51e6f85f077d0b8cc9b
Merge "Don't let AFT set unsupported groups"