Adds nodes to an existing LBaaS instance

        :param string lb_id:  Balancer id

        :param list nodes:  Nodes to add. {address, port, [condition]}

        :rtype :class:`list`

def add_lb_nodes(self, lb_id, nodes):
        """
        Adds nodes to an existing LBaaS instance

        :param string lb_id:  Balancer id

        :param list nodes:  Nodes to add. {address, port, [condition]}

        :rtype :class:`list`
        """
        log.info("Adding load balancer nodes %s" % nodes)
        resp, body = self._request(
                'post', 
                '/loadbalancers/%s/nodes' % lb_id,
                data={'nodes': nodes})
        return body