block: test 'blockdev-snapshot' using a file BDS as the overlay
This test checks that it is not possible to create a snapshot if the requested overlay node is a BDS which does not support backing images. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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