LU-1898 test: new tests 8[a,b,c,d,e] need 2.3 or later

LU-1898 test: new tests 8[a,b,c,d,e] need 2.3 or later

check lustre version to make sure tests do not run
on unsupported version

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: I5b284af44a6132070b8e89659b7981844a74555e
Reviewed-on: http://review.whamcloud.com/3986
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>