[Libguestfs] Preliminary release notes for nbdkit 1.22

[Richard W.M. Jones]

... are here:

https://github.com/libguestfs/nbdkit/blob/master/docs/nbdkit-release-notes-1.22.pod

I understand that there are more API changes that we're still hoping
to get into 1.22.  I added a note about .default_export even though
it's not yet upstream.

Rich.

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