Networking support/options and Networking drivers have been, uhm,
messy to navigate for some time now.   BenH mentioned this
and I was already looking into options to clean it up.

This is a cleanup of Networking support/options and Networking Drivers.
It presents a more consistent interface and lists similar driver
groups and protocol groups closer together.
It also moves the IBMVETH driver so that it no longer breaks the
dependency tree, allowing other drivers (nearby in Kconfig file)
to be presented in a more linear manner.