[Libguestfs] [nbdkit PATCH 1/3] server: Implement nbdkit_is_tls for use during .open

[Richard W.M. Jones]

Largely a mechanical patch, and the changes at the beginning adding
the new API and updating documentation were fine, so ACK.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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