LU-5823 clio: add coo_getstripe interface

LU-5823 clio: add coo_getstripe interface

Use cl_object_operations::coo_getstripe() to handle
LL_IOC_LOV_GETSTRIPE ops.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Iee0d007f773ead35434eb88e7ca2f31c0bc42c11
Reviewed-on: http://review.whamcloud.com/12452
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>