LU-7144 tests: skip scrub/lfsck test under interoperation

LU-7144 tests: skip scrub/lfsck test under interoperation

Since the scrub/lfsck test are only for server side logic,
it is unnecessary to test scrub/lfsck under interoperation
mode, skip them.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I044030b3bace787809d7cfd5622000b44a8be789
Reviewed-on: http://review.whamcloud.com/17520
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>