Retrieve all the metadata tags associated with your ELB(s).

    :type load_balancer_names: list
    :param load_balancer_names: An optional list of load balancer names.

    :rtype: list
    :return: A list of :class:`boto.ec2.elb.tag.Tag` objects

def _get_all_tags(conn, load_balancer_names=None):
    '''
    Retrieve all the metadata tags associated with your ELB(s).

    :type load_balancer_names: list
    :param load_balancer_names: An optional list of load balancer names.

    :rtype: list
    :return: A list of :class:`boto.ec2.elb.tag.Tag` objects
    '''
    params = {}
    if load_balancer_names:
        conn.build_list_params(params, load_balancer_names,
                               'LoadBalancerNames.member.%d')

    tags = conn.get_object(
        'DescribeTags',
        params,
        __utils__['boto_elb_tag.get_tag_descriptions'](),
        verb='POST'
    )
    if tags[load_balancer_names]:
        return tags[load_balancer_names]
    else:
        return None