Set up a local UDP socket to drive testing

Using socketpair doesn't work because you end up with an AF_UNIX socket,
and it even if you _can_ use sendto with anonymous unix-domain sockets
(which the documentation is mute on and it doesn't seem worth experimenting
on), the zephyr library doesn't allocate enough storage for a sockaddr_un,
and although I'm not above fixing that, I determined that for structural
reasons it's too annoying right now.  (But once we have a test suite...)

Anyway, cons up a udp socket, and extract a port number from the library,
and use the python socket interface to send the zephyr packet.

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