If SERVER-114168 doesn't pan out, how else could we pass TLS sessions between processes? Perhaps there are OpenSSL APIs that we could use to serialize/deserialize session state. To test this we should:
1. Find the necessary APIs.
2. Extend the listening process to negotiate TLS, then
3. Extend the listening process to pass the socket and the TLS session state to the echo server.
4. Then, extend the echo server to load the session state, and use it to speak TLS with the client.