vhost: support for "standalone" vhost-user daemons #174
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Although originally introduced for VDPA we also want to support this for vhost-user. This requires supporting SET/GET status by moving the trait implementations around and a new message called BACKEND_SPECS which allows the backend to report its capabilities to the VMM as it boots up.
I suspect I need some extra handling for properly setting things like FEATURES_OK and DEVICE_NEED_RESET. And some tests of course. I shall be shortly posting the RFC patches for QEMU to support this. As such this will be a draft PR for comment for now.