LU-3547 tests: skip unsupported subtest on old servers

LU-3547 tests: skip unsupported subtest on old servers

chmod of .lustre/fid is unsupported on servers older than v2.4.
Add a version check to skip the unsupported op in sanity test 154a
on old servers for interop testing of 2.4+ clients on 2.3 servers.

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: I353c93e8d1501944cad8f638de69a0432539249f
Reviewed-on: http://review.whamcloud.com/6879
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>