LU-2062 utils: HSM Posix CopyTool

POSIX HSM CopyTool utils named lhsmtool_posix.
This user space command is the 'glue" between Lustre-HSM
and a POSIX filesytem used as a backend.
The main functionalities implemented are:
daemon mode:
- archive: read in lustre write with POSIX backend
- restore: read in POSIX backend write to Lustre
- remove: remove an entry from backend
cmd line mode:
- import: create in lustre a released file from a backend file
- rebind: change the FID associated to a file in the backend
- maxseq: get the larger sequence of FID found in the backend

The 2 last options are used for disaster recovery mode

This tools is also used for all the non regression tests made in
sanity-hsm.sh

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Signed-off-by: Henri Doreau <henri.doreau@cea.fr>
Change-Id: I2d6cf5c9bd1f714ad407929f4603f68c5b8f5ec3
Reviewed-on: http://review.whamcloud.com/4737
Tested-by: Hudson
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>