Virtio 1.2 update

Hello, all! Today the TC started voting on promoting the latest specification working draft virtio-v1.2-wd01 to a Committee Specification Draft, and starting a 30 day public review of the same.  The voting will conclude by end of the month, if approved and if the review also goes well we should be able to release revision 1.2 by June.  Thanks to everyone involved!

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MST