LU-3363 api: HSM import uses new released pattern

Import creates a released file using new RAID pattern flag
Import used a new ioctl() to implement the import in the
client kernel.
Add a -L|--layout option to lfs getstripe and lfs find

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: I39103e6f90bd73dc09cde49086d223d717e41cd2
Reviewed-on: http://review.whamcloud.com/6536
Tested-by: Hudson
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>