Attaches load balancer to one or more subnets.
        Attaching subnets that are already registered with the 
        Load Balancer has no effect.

        :type name: string
        :param name: The name of the Load Balancer

        :type subnets: List of strings
        :param subnets: The name of the subnet(s) to add.

        :rtype: List of strings
        :return: An updated list of subnets for this Load Balancer.

def attach_lb_to_subnets(self, name, subnets):
        """
        Attaches load balancer to one or more subnets.
        Attaching subnets that are already registered with the 
        Load Balancer has no effect.

        :type name: string
        :param name: The name of the Load Balancer

        :type subnets: List of strings
        :param subnets: The name of the subnet(s) to add.

        :rtype: List of strings
        :return: An updated list of subnets for this Load Balancer.

        """
        params = {'LoadBalancerName' : name}
        self.build_list_params(params, subnets, 
                               'Subnets.member.%d')
        return self.get_list('AttachLoadBalancerToSubnets', 
                             params,
                             None)