Xen3 update

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hi,
I've just commited some of my current work on Xen-3.0 support.
This include xenbus (the interface to xenstore) and a network frontend
driver. I also added a kernel config file (XEN3_U).

With this it's now possible to run a domU on Xen3 with root on NFS,
but it can't talk with the domain0 on the same host because linux doesn't
update the TCP/UDP checksum fields when talking to a domU on the same physical
hardware, and NetBSD drops the packet because of the bad checksum. I'll have
to look at how to fix this.

A block device driver should come soon.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--