LU-3726 tests: DNE specific tests for HSM.

LU-3726 tests: DNE specific tests for HSM.

Add tests in sanity-hsm.sh to check DNE specific
features in HSM code: copytool registration to
several MDTs, HSM request shunting to the right MDT,
and coumpound request splitting.

Test-Parameters: mdtcount=2 mdscount=2 testlist=sanity-hsm
Signed-off-by: Thomas Leibovici <thomas.leibovici@cea.fr>
Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: I6706571c92e4c3e978b2143dd5bdef4b73d2c1e2
Reviewed-on: http://review.whamcloud.com/7571
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>