fixed the bugzilla private group names rhbz#985881

- the actual group list can be retrieved here:
  https://bugzilla.redhat.com/userprefs.cgi?tab=permissions

Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>