Is there a public interface for controlling the connection limit on servers created with `loop.create_server`? Specifically a way to ~ `remove_reader(_accept_connection)` temporarily.
I've developed a statsd proxy for a client that needs to implement backpressure all the way to the listening socket but I don't see a good way to pause the _accept_connection handler that monitors the listening socket for read events. I'd be happy to implement my own logic for the back pressure using a public `pause_serving()`/`resume_serving()` API but a simple `max_connections` param to the create_server would suffice too. Cheers, JM
