Forcefully override a setting set by zappa_settings (for the current stage only)
        :param key: settings key
        :param val: value

def override_stage_config_setting(self, key, val):
        """
        Forcefully override a setting set by zappa_settings (for the current stage only)
        :param key: settings key
        :param val: value
        """
        self._stage_config_overrides = getattr(self, '_stage_config_overrides', {})
        self._stage_config_overrides.setdefault(self.api_stage, {})[key] = val