Generate an SDK for a given SDK.

        Returns a file like object that streams a zip contents for the
        generated SDK.

def get_sdk_download_stream(self, rest_api_id,
                                api_gateway_stage=DEFAULT_STAGE_NAME,
                                sdk_type='javascript'):
        # type: (str, str, str) -> file
        """Generate an SDK for a given SDK.

        Returns a file like object that streams a zip contents for the
        generated SDK.

        """
        response = self._client('apigateway').get_sdk(
            restApiId=rest_api_id, stageName=api_gateway_stage,
            sdkType=sdk_type)
        return response['body']