newer versions of mkfs.extX ask before creating a filesystem
on a device which appears to already have a filesystem.
We don't want that, so add the -F flag.
Also be explicit about fs type as one shouldn't depend on defaults.
Signed-off-by: NeilBrown <neilb@suse.com>
"--wait" will return non-zero status if it didn't need to wait.
This is no a reason to fail a test.
So ignore the return status from those commands.
Signed-off-by: NeilBrown <neilb@suse.de>