DockerInfoDict, DockerContainerDict, DockerImageDict, DockerVolumeDict,
DockerNetworkDict and the OSDriver declaration of get_docker_info() go.
They described napalm-linux' old CLI reading, which napalm-linux 0.3.0
dropped. There is no container model here: netOrk reads and handles
containers over the Engine API (NetOrk/netork#765, phase 9); this
package only gives access to the engine.
Version 4.0.0.
christianmanivong