MB-100: add groups to conf file

Change-Id: If1f08c608a0778a5c73bff6925422098558017a3
Reviewed-on: http://review.couchbase.org/25535
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>