def set_exit_handler(self):
        """Set the signal handler to manage_signal (defined in this class)
        Only set handlers for signal.SIGTERM, signal.SIGINT, signal.SIGUSR1, signal.SIGUSR2

        :return: None
        """
        signal.signal(signal.SIGINT, self.manage_signal)
        signal.signal(signal.SIGTERM, self.manage_signal)
        signal.signal(signal.SIGHUP, self.manage_signal)
        signal.signal(signal.SIGQUIT, self.manage_signal)
Set the signal handler to manage_signal (defined in this class)
        Only set handlers for signal.SIGTERM, signal.SIGINT, signal.SIGUSR1, signal.SIGUSR2

        :return: None