Qemu guest agent support#533
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This allows the built-in socat of the bhyve brand to allow I/O multiplexing between stdin/stdout and a UNIX domain socket belonging to the VM, such as a virtual COM port. Unfortunately, the original socat implementation wasn't easily adaptable for this, so the result looks a bit like two different socat implementations merged in one.
This adds a new ksh script to /usr/lib/brand/bhyve, which can be used to talk to a qemu-guest-agent inside the guest listening on the 2nd serial port (COM2 in Windows parlance). This change depends on the socat changes in the previous commit.
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This code was written by Patrick van der Linden of EFit Partners. My part in this is helping with review and integration.
The first commit extends socat to support I/O multiplexing to/from stdout/stdin in addition to a TCP socket, while then 2nd adds a ksh script to talk to the qemu guest agent.
At this time, this pull request should be regarded as a request for comments, not as code that's completely ready for integration.