[Libguestfs] [PATCH nbdkit 0/4] server: Add nbdkit_shutdown() call and two new filters.
This adds a new nbdkit_shutdown() API whereby plugins and filters can
request that the server shuts down (asynchronously) during the serving
phase.
Two new filters are added, one of which depends on this feature and
the other not needing it but being somewhat related.
Rich.