Collective May/2011 update for Xen

Xen:
- 675363 - Random lockups with kernel-xen. Possibly
graphics related.
- 679344 - Xen: multi-vCPU pv guest may crash host
- 681044 - update xenpaging.autostart.patch
- 681302 - xm create -x returns "ImportError: No
module named ext"
- 688473 - potential buffer overflow in tools
- 691738 - Xen does not find device create with npiv block

vm-install:

- 688757 - SLED10SP4 fully virtualized in SLES10SP4 XEN -
kernel panic
- 678152 - Xen: virt-manager: harmless block device admin
actions on FV guests mess up network (VIF) device type
==> network lost.
- 631680 - OpenSUSE 11.3 KVM install of windows xp fails on
first reboot during installation.