Remove tokio-rustls as a direct dependency of Deno and refactor
test_server to reduce code duplication.
All tcp and tls listener paths go through the same streams now, with the
exception of the simpler Hyper http-only handlers (those can be done in
a later follow-up).
Minor bugs fixed:
- gRPC server should only serve h2
- WebSocket over http/2 had a port overlap
- Restored missing eye-catchers for some servers (still missing on Hyper
ones)
