LU-2693 tests: check Lustre version in conf-sanity test 66

LU-2693 tests: check Lustre version in conf-sanity test 66

Lustre starts supporting the "replace nids" feature
(commit 6aa30ff) since version 2.3.59. We need add
a Lustre version check into conf-sanity test 66 to
make sure the test does not run on unsupported
Lustre version.

Test-Parameters: envdefinitions=SLOW=yes \
serverjob=lustre-b2_1 serverbuildno=164 \
testlist=conf-sanity

Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: I7eee38664e66059bbc028c3eb7d9741b1351b883
Reviewed-on: http://review.whamcloud.com/5198
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>