vringh

This introduces vringh, which are generic accessors for virtio rings (host side).
There's a host-side implementation in vhost, but it assumes that the rings are
in userspace, and is tied to the vhost implementation.  I have patches to adapt
it to use vringh, but I'm pushing this in the next merge window for Sjur, who has
CAIF patches which need it.

This also includes a test program in tools/virtio.  There's a fixup patch for
the current tools, since they didn't compile for me.  MST?

Review and comments welcome!
Rusty.

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