LU-13257 llite: Disallow users to set/clear group lock flag

LU-13257 llite: Disallow users to set/clear group lock flag

Group locks are created/freed via dedicated ioctls. Disallow manually
setting or clearing the flag.

HPE-bug-id: LUS-12078
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Signed-off-by: Matt Ezell <ezellma@ornl.gov>
Change-Id: Id5022cc02a7bdce2f0150592470e8336b4537a61
Reviewed-on: https://es-gerrit.hpc.amslabs.hpecorp.net/162708
Reviewed-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Tested-by: Alexander Lezhoev <alexander.lezhoev@hpe.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53782
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>