Proposal: Container device add/remove CLI/API documentation

Device add/remove CLI and API documentation.  This is being proposed as
the new API and CLI to see how people like it.

Co-Authored-By: Chris Alfonso <calfonso@redhat.com> (github: calfonso)
Docker-DCO-1.1-Signed-off-by: Ian Main <imain@redhat.com> (github: imain)
You could give full information in order to remove.  The issue is we need to know the major and minor and type of device to remove it.  This is available in the container but then we'd have to enter the containers namespace to get that information (which would be a bit complex but doable).  It's much easier to get it from the device file locally.