LU-4703 mdd: do not skip xattr sanity check for all cases

LU-4703 mdd: do not skip xattr sanity check for all cases

xattr sanity check should be done at all times.
Otherwise we are risking letting a non root user setting
access acl on any file.

Lustre-commit: 6d7066989c06bdf6c86f5b8b61d542fda8e5739e
Lustre-change: http://review.whamcloud.com/9469

Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au>
Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Change-Id: Ic763424b2a20dab00c7e62de1f5c8553cd0cdaa8
Reviewed-on: http://review.whamcloud.com/9558
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>