LU-14613 tests: fix sanity/60f on a local setup

LU-14613 tests: fix sanity/60f on a local setup

as fail_loc is shared among client and server on a local setup,
it can hit just before rm -f $TMP/$tfile*. given it's marked
with FAIL_ONCE, the log won't be dumped again.
to fix this do cleanup rm earlier.

Test-Parameters: trivial
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Ifd70335c44bfe2e1970e1441837dcb3545c40ab0
Reviewed-on: https://review.whamcloud.com/43308
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>