Otherwise, if we use the same port number and same HTTPServer, if enough
clients try to contact us and, we won't be able to accept child processes
having been spawned.
Also add some temporary debugging output here and there to debug lifecycle
management issues.
Works now for the trivial 'connect' test program. Still need to add
pre-spawning of a new child process as soon as an existing one from the pool
has been taking into use. And need to test with the actual JS client.
