Directly invoke a named Lambda function with a payload.
        Returns the response.

def invoke_lambda_function( self,
                                function_name,
                                payload,
                                invocation_type='Event',
                                log_type='Tail',
                                client_context=None,
                                qualifier=None
                            ):
        """
        Directly invoke a named Lambda function with a payload.
        Returns the response.
        """
        return self.lambda_client.invoke(
            FunctionName=function_name,
            InvocationType=invocation_type,
            LogType=log_type,
            Payload=payload
        )