[Blueprint server-o-xen-host] Improve Ubuntu as an Xen host.

[Chuck Short]

Blueprint changed by Chuck Short:

Whiteboard changed:
  Work Items:
  
- Sync Xen 4.1 from Debian Unstable: TODO
+ Sync Xen 4.1 from Debian Unstable: DONE
  Sync xen-common from Debian Unstable: TODO
  Update xen dependencies for migration between xen-3.3 to xen-4.1: TODO
  Check for upstream bug fixes that has not made it into debian yet: TODO
  Turn on dom0 kernel support in -server kernel: TODO
- Write MIR for libxen4l to replace libxen3 in main: TODO
+ Write MIR for libxen4 to replace libxen3 in main: TODO
  Replace libxen3 dependency with libxen4 in libvirt: TODO
  Test build changes for libvirt with libxen-devel: TODO
  Remove xen-3.3 from the archive: TODO
  Remove ubuntu-xen-server from archive: TODO
  Remove ubuntu-xen-desktop from archive: TODO
  Update xenner to 0.48: TODO
  Test xen booting PAE on i386 without libvirt: TODO
  Test xen booting on amd64 without libvirt: TODO
  Test xen PAE on i386 with libvirt: TODO
  Test xen on amd64 with libvirt: TODO
  Test xen hvm CD install on i386: TODO
  Test xen hvm CD install on amd64: TODO
  Test xen-tools to make sure that it works with xen 4.1: TODO
  Test live-helper to see if it works with xen 4.1: TODO
  Create a small xen meta package to make xen install easier: TODO

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Improve Ubuntu as an Xen host.
https://blueprints.launchpad.net/ubuntu/+spec/server-o-xen-host