LU-197 Remove files after fsx in sanity-benchmark.sh to drop locks.

LU-197 Remove files after fsx in sanity-benchmark.sh to drop locks.

commit 9f1f7c4040440b8bab6130d30e9ecd1e8b803657
Date:   Mon Jan 31 14:32:08 2011 +0100

b=23729 cancel_lru_locks not working cause some locks are still in cache from mmap files

Fix sanity-benchmark.sh to remove files after fsx otherwise client keeps locks acquired for mmap files in cache.

a=Johann Lombardi

Signed-off-by: YangSheng <ys@whamcloud.com>
Change-Id: Ib9683b5e8fce550259a1c3bfd617aa04c2f3abdc
Reviewed-on: http://review.whamcloud.com/408
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>