create _require_metadata_journaling, and add to tests that need it

create _require_metadata_journaling, and add to tests that need it

Many tests use dm_flakey to trigger log replay, but for filesystems that
don't support metadata journaling, this causes failures when it shouldn't.
(i.e. we can hardly test log replay if there is no log, and the subsequent
filesystem check will turn up errors).

For some tests they actually sync everything we care about, and find
inconsistencies elsewhere, but I erred on the side of simply not running
the test in most cases.

Tested-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>