LU-1187 tests: add cleanup for sanity 24q.

Add trap cleanup for sanity 24q.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: Ie8b096cd9906d07812d743cdccdf619b977aaed6
Reviewed-on: http://review.whamcloud.com/4521
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>