[Libguestfs] New Rust bindings for nbdkit

[alan somers]

The existing Rust bindings for nbdkit aren't very idiomatic Rust, and they
are missing a lot of features.  So I've rewritten them.  The new bindings
aren't backwards compatible, but I doubt that's a problem.  Most likely,
nobody has tried to use them yet, since the crate hasn't even published to
crates.io.  Please review the attached patch.
-Alan
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