Add volume ls/inspect/rm commands

Also adds the naming to volumes.
When a volume is created using "docker run -v" a name is automatically
generated.
This does not add any other way to create a volume, that would be done
by a separate command.

Implements Proposal https://github.com/docker/docker/issues/8363

Signed-off-by: Brian Goff <cpuguy83@gmail.com>