LU-7229 hsm: relax time check of sanity-hsm test_60

LU-7229 hsm: relax time check of sanity-hsm test_60

If the copytool and test script round clock time in a different
way, a strict time check would causes failure.

Signed-off-by: Li Xi <lixi@ddn.com>
Change-Id: I97ebe02d6a0cdd9425ef68e5770e63ac9968ebaa
Reviewed-on: http://review.whamcloud.com/17742
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>