[RFC PATCH v3] virito-serial: A guest <-> host interface

Hello,

This is a new iteration of the patches that implement virtio-serial. Changes
include:

* Adding support for port hot-add
* Creating ports at specific ids that can be bound to specific apps / usage
* Cleanups

This code still doesn't get rid of the support for assigning names
to ports but it just has to be ripped out.

Comments welcome.

		Thanks,
			Amit.