LU-10979 test: correct the version code check in sanity-sec.sh

LU-10979 test: correct the version code check in sanity-sec.sh

The following patch was landed to 2.11.50 instead of 2.10.59, so
the version code check in sanity-sec.sh test_27a/b should be
corrected.
- Lustre-commit: 5b64d9fb0d5c5f292548c23e7841cc30f7a8423e
- Lustre-change: https://review.whamcloud.com/#/c/31450

Test-Parameters: trivial testlist=sanity-sec envdefinitions=ONLY=27 \
serverjob=lustre-b2_11 serverbuildno=2

Change-Id: I641ada8fb75d6347873a86ef453ebafd029876af
Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-on: https://review.whamcloud.com/32238
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>