cmdserver: include pid of server handling requests in hello message
Because unix-mode server forks child process per connection, client does not
know the pid of the server that will handle requests. The pid is necessary
to interrupt hung process:
1. client connects to socket server
2. server accepts the connection, forks, and tells pid
3. client requests "runcommand pull"
.. hung ..
4. client sends SIGINT to the (forked) server
5. server returns from I/O wait
Note that getsockopt(SO_PEERCRED) of Linux cannot be used because the server
fork()s after accept().
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