LU-14 tests: add version check code to conf-sanity test 69

LU-14 tests: add version check code to conf-sanity test 69

This patch adds Lustre version check codes into conf-sanity
test 69 to make the test work with servers which do not have
the following patch:

Lustre-commit: db6613f5bed1606cc8f97b46d1b298746af03a75
Lustre-change: http://review.whamcloud.com/7443

Test-Parameters: envdefinitions=SLOW=yes,ENABLE_QUOTA=yes,ONLY=69 \
ossjob=lustre-b2_3 mdsjob=lustre-b2_3 ossbuildno=41 mdsbuildno=41 \
testlist=conf-sanity

Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: I43e12fda5c0c83848b96bd7f377b7b4514ed5d5e
Reviewed-on: http://review.whamcloud.com/8412
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>