TTornado server doesn't handle closed connections properly

The Tornado Thrift server uses a TTornadoStreamTransport that uses Tornado's IOStream to handle incoming connections. The main method for handling this is a while loop in `handle_stream` that waits for incoming data. This works fine until the client decides to stop the connection in which case TTransportException.END_OF_FILE is raised. This exception is expected behaviour and should be caught appropriately in `handle_stream`.