LU-5373 test: ignore command return value in sanity test_33b

LU-5373 test: ignore command return value in sanity test_33b

Since the test is only looking for a panic and the command
used has different returns depending on kernel version,
ignore the command return value in all cases.

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: I63e9d0589b1c11736c9afbb8bee8ea4e11b30a4f
Reviewed-on: http://review.whamcloud.com/12992
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>