LU-3026 llite: setattr to override permission check for owner

Otherwise, iozone creates no permission file and will fail at
mdd_permission check.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: If9f97aeebe0ff12b535dd3b4ce131eb8079c1b51
Reviewed-on: http://review.whamcloud.com/5924
Tested-by: Hudson
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>