Feature #12901: librbd: zone + zonegroup configuration
Enabling/disabling journaling needs to interact with mirroring
If the pool mirroring state is set to pool-level and the journaling feature is enabled (dynamically or during image creation), automatically enable mirroring on the image. If journaling is dynamically disabled, automatically disable mirroring if the mirroring state is set to pool-level or throw an error if set to image-level (i.e. require it to be manually disabled first).