LU-3341 mdt: HSM coordinator client interface

This patch implements the HSM coordinator methods
used by client to add/remove/list HSM actions on
FID.

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: I0f2d7bfc3d98d98cb13040fad0f7f585c6f3dadf
Reviewed-on: http://review.whamcloud.com/6532
Tested-by: Hudson
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>