LU-6413 lod: set FLAGS all stripes of striped dir

LU-6413 lod: set FLAGS all stripes of striped dir

Except permission and time, flags should be set on
each stripe of striped dir as well, otherwise
chattr can not set special flags (immutable etc)
correctly on striped dir.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: I8b3274b674bd1b8b41f95bb9299245aa8c2905c3
Reviewed-on: http://review.whamcloud.com/14278
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>