LU-6106 tests: Skip test_16 to test_23 if MDS version older than 2.6.90

LU-6106 tests: Skip test_16 to test_23 if MDS version older than 2.6.90

Skip sanity-sec test_16 to test_23 if MDS version older than 2.6.90

Change-Id: I0f95dae3a7a0bdef52160a3ca76fefac6765007c
Signed-off-by: Wei Liu <wei3.liu@intel.com>
Reviewed-on: http://review.whamcloud.com/13509
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>