LU-8129 tests: add version check to sanity.sh test_102n

LU-8129 tests: add version check to sanity.sh test_102n

We don't support the LFSCK compatibility between Lustre-2.9 and
Lustre-2.6 any more, so this patch is to add version check to
sanity.sh test_102n to make the test interoperate with the clients
that do not have the following change:
Lustre-commit: fd4ab6e6ae877c88e46c35c517349285aa6226d2
Lustre-change: http://review.whamcloud.com/20112

Test-Parameters: trivial
Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: Ibf2c72e9b648df5666ed7a87c8372ea81b83a029
Reviewed-on: http://review.whamcloud.com/23687
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>