wrapper for waypoint_clear_all_send

def waypoint_clear_all_send(self):
        '''wrapper for waypoint_clear_all_send'''
        if self.mavlink10():
            self.mav.mission_clear_all_send(self.target_system, self.target_component)
        else:
            self.mav.waypoint_clear_all_send(self.target_system, self.target_component)