http2: add http fallback options to .createServer

This adds the Http1IncomingMessage and Http1ServerReponse options
to http2.createServer().

PR-URL: https://github.com/nodejs/node/pull/15752


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>