Allow more flexible HTTP bindings

Play allows binding a single port for http traffic and a single port for https. Each port will serve exactly the same routes.

This issue is to track an improvement where multiple ports can be bound for https (for example) where each port serves traffic using different settings (e.g. HTTP/1.x vs HTTP/2[1])

[1] that's a bad example because HTTP/1 and HTTP/2 should coexist in a single port and protocol negotiation be supported (that is a different discussion though).