LU-8998 clio: getstripe support comp layout

LU-8998 clio: getstripe support comp layout

{get/set}stripe support composite layout

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: Iafe5205a79f721be1ec5ec83ab80a86a4b537e18
Reviewed-on: https://review.whamcloud.com/24851
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>