We currently maintain a reference to the ServiceEntryPoint in TransportLayerASIO here. However, it would be advantageous to reference the ServiceContext instead. This will allow us to get the ServiceEntryPoint via decoration---and maybe construct/start/stop the ServiceEntryPoint as part of constructing/starting/stoping the TransportLayerASIO. It will also allow the TransportLayerASIO to access other networking related types in the future.