Stops a running script.

        script_id:= id of stored script.

        ...
        status = pi.stop_script(sid)
        ...

def stop_script(self, script_id):
        """
        Stops a running script.

        script_id:= id of stored script.

        ...
        status = pi.stop_script(sid)
        ...
        """
        res = yield from self._pigpio_aio_command(_PI_CMD_PROCS, script_id, 0)
        return _u2i(res)