LU-10059 tests: sanityn 32a restore parameters

LU-10059 tests: sanityn 32a restore parameters

Test sanityn test 32a does not restore parameters on error,
making other tests fail because lockless truncate is still
enabled.

Add cleanup.

Also fix use of stack_trap with restore_params in two other
tests to clean up temporary file.

Test-Parameters: trivial testlist=sanityn

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: I315eb5c53cc1722833b1159c5ad908c3b7bf5550
Reviewed-on: https://review.whamcloud.com/34070
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>