* Treat containerd snapshotter/overlayfs driver as supported
With home-assistant/operating-system#4252 the storage driver would
change to "overlayfs". We don't want the system to be marked as
unsupported. It should be safe to treat it as supported even now, so add
it to the list of allowed values.
* Flip the logic
(note for self: don't forget to check for unstaged changes before push)
* Set valid storage for invalid logging test case
