LU-5823 clio: add cl_object_fiemap()

LU-5823 clio: add cl_object_fiemap()

* Add cl_object_operations::coo_fiemap().
* Add cl_object_fiemap() to get FIEMAP mappings.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Ie32eb5ddb8d2daa1a66055f347cef4757d039e75
Reviewed-on: http://review.whamcloud.com/12535
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>