[rbldnsd] Disabling ipv6-specific tests

[Jeff Dairiki]

On Fri, Aug 02, 2013 at 02:54:48PM -0400, Michael Orlitzky wrote:
> While we're changing things,
> 
>    def ip4trie(zone_data):
>   -    """ Run rbldnsd with an ip6trie dataset
>   +    """ Run rbldnsd with an ip4trie dataset

Fixed in my github ipv6 branch: https://github.com/dairiki/rbldnsd/commit/cb837da