LU-9182 tests: SKIP sanity/205 for older version of MDS

LU-9182 tests: SKIP sanity/205 for older version of MDS

LU-5946 is not present on 2.5.x esp changes from
"LU-5946 lprocfs: free expired jobstats after /proc read"

The changes in sanity/205 rmdir w.r.t DNE are to be SKIPPED
where we are seeing the failure.

Signed-off-by: Parinay kondekar <Parinay.Kondekar@seagate.com>
Change-Id: I02d24eddaac3fc65e801eb86f2e878e117d6cdb1
Reviewed-on: https://review.whamcloud.com/25813
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>