Terminates a set of nodes. May be overridden with a batch method.

def terminate_nodes(self, node_ids):
        """Terminates a set of nodes. May be overridden with a batch method."""
        for node_id in node_ids:
            logger.info("NodeProvider: "
                        "{}: Terminating node".format(node_id))
            self.terminate_node(node_id)