Mjt qemu packages

This branch/MR contains 3 rust crates which are needed to build libblkio library.

This is still my first try at rust packaging.

There's one thing in there which I don't like - it is virtio-bindings, namely the fact it contains files generated by bindgen, - it probably will be better to generate them at build time instead of using pre-generated .rs code. On the other hand, that's about the whole thing, there's nothing in there besides packaging and bindgen-generated stuff (which is updated on a regular basis)