[Java Broker] make the 1.0 protocol plugin use a single ProtocolEngineCreator

The 1.0 protocol plugin for the broker currently has two ProtocolEngineCreators. Certain areas of the code (such as the 'default supported reply' handling in MultiVersionProtocolEngine#received, and the PortAdapter and Port model objects in general) make assumption that there is only one ProtocolEngineCreator for a given protocol version as this was always the case previously, and so expected behaviour based on this assumption may not hold. The 1.0 protocol plugin should also use a ProtocolEngineCreator to simplify things generally and remove the issue.