LU-6899 test: rename sanity test_162 to test_162a

LU-6899 test: rename sanity test_162 to test_162a

Made this test be run separately from others in this group.
- sanity test_162 is renamed to test_162a

Signed-off-by: Elena Gryaznova <elena.gryaznova@seagate.com>
Seagate-bug-id: MRP-2496
Reviewed-by: Alexander Lezhoev <alexander.lezhoev@seagate.com>
Change-Id: I945b5ab006722d230058ebf44538480e018964c9
Reviewed-on: http://review.whamcloud.com/15710
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>