fuzzy: make freezing optional for scrub stress tests

Make the freeze/thaw loop optional, since that's a significant change in
behavior if it's enabled.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
2 files changed