LU-6345 test: compare /bin/sleep in sanity-hsm.sh test_30c

LU-6345 test: compare /bin/sleep in sanity-hsm.sh test_30c

In case /bin/sleep is modified during the test, we do a checksum
at the beginning and the end of the test respectively, and won't
mark the test a failure if the checksum has changed.

Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I1ff472ea6052e2df9ba9fd4c78a4cf53686e1ccd
Reviewed-on: http://review.whamcloud.com/14025
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>