LU-18424 tests: sanity to cleanup files

LU-18424 tests: sanity to cleanup files

add stack_trap's to few sanity's subtests to remove files upon
subtest competion.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Ibcdafa330ca0db1dc76364e46c4d898c912f4139
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56902
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>