def stop_server(self):
        """
        Stop serving.  Also stops the thread.
        """
        if self.rpc_server is not None:
            try:
                self.rpc_server.socket.shutdown(socket.SHUT_RDWR)
            except:
                log.warning("Failed to shut down server socket")

            self.rpc_server.shutdown()
Stop serving.  Also stops the thread.