[Crunch] Docker cleaner doesn't consistently remove container volumes
A static compute node that was installed following our install guide ran out of space on the partition holding Docker data. Most of that space was gone to two volumes holding tmp data for Crunch worker containers.
There were no containers on the node (not even stopped), so the Docker cleaner apparently did its job of removing those. However, the volumes stuck around eating space. The Docker cleaner needs to remove those as well when it removes the containers.