LU-5142 test: add version check to conf-sainty.sh test_43

LU-5142 test: add version check to conf-sainty.sh test_43

This patch adds Lustre version check codes into conf-sanity
test_43 to make the test work with servers which do not have
the following patches:

Lustre-commit: 3064318df90ce7019b83c8a7f80e93a9634c00fa
Lustre-change: http://review.whamcloud.com/5700
Lustre-commit: 917b0a17d4e50db9f966763925a2dc860d932a3b
Lustre-change: http://review.whamcloud.com/9221

Test-Parameters: envdefinitions=SLOW=yes,ONLY=43 testlist=conf-sanity ossjob=lustre-b2_5 mdsjob=lustre-b2_5 ossbuildno=61 mdsbuildno=61
Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I9fad8d7002eb29b3da89213a6afc3c88de611b8f
Reviewed-on: http://review.whamcloud.com/10675
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>