LU-321 Don't assume file system name for some test

LU-321 Don't assume file system name for some test

Some of the test assume the file system name is lustre
which is not always the case.

Change-Id: I582aa81fce5d1a881837dfa28bb0d6d84cfb5547
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/253
Tested-by: Hudson
Reviewed-by: Brian J. Murrell <brian@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>