"Same website on IPv6 and IPv4" test should not be required

[peterjin-org]

Currently, internet.nl gives an error if the IPv6 and IPv4 versions of a website are different. However, this is not useful for an IPv6-only website whose "IPv4 version" just says something like "You need to enable IPv6 to view this website" and has no actual content (e.g. earthite.com). Instead, this subtest should only be made a warning, in order to still catch IPv6-related misconfigurations, but not to disqualify websites that may have a legitimate reason to have different content on IPv6 and IPv4.

[mxsasha]

Easy test site: ip.tyk.nu

@baknu as part of this, I have added the use of detail web ipv6 web-ipv46 verdict info and we no longer use detail web ipv6 web-ipv46 verdict bad. Text can probably mostly be copied, maybe tweaked. Explanation may also need to be updated. This needs to be done in the content repo.