container: T4000: use unique storage for container image

Do no longer store container images which are pulled from any registry to
/config/containers. Instead save them to a unified location that is the same
accross all images on the system: /usr/lib/live/mount/persistence/container/storage

Reason for this change is, while living under /config/containers a VyOS image
upgrade copied all downloaded container images to the new image - doubling the
used space per image on every upgrade. With the new location the images are
all the same for every VyOS image running. Container userdata can still be
stored under /config and copied to a newer image making rollbacks still
efficient.

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