LU-5339 tests: Un-duplicate test_24 and skip if MDS is 2.5.2 or older

LU-5339 tests: Un-duplicate test_24 and skip if MDS is 2.5.2 or older

Un-duplicate test_24 and disable the test if MDS version
is 2.5.2 or older.

Change-Id: I3564c44a21bf149baf09294d42edd1529179736a
Signed-off-by: Wei Liu <wei3.liu@intel.com>
Reviewed-on: http://review.whamcloud.com/11262
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>