Make the fix for skip groupmod issue available in GlusterFS stacks

The problem of groupmod errors AMBARI-5748 has been already fixed by introducing new ambari config option: ignore_groupsusers_create.

The problem is that this fix is not directly usable with GlusterFS stack, because the new option has been created in HDFS component which is not accessible (for obvious reasons: GlusterFS conflicts with HDFS).

For those reasons, the new config should be made available for GlusterFS stack as well.