Fix IP configuration for Kape servers
We found with grazzolini that the IPv6 issues with europe.mirror.pkgbuild.com
(TCP packet loss, no ping reply) were happening because its IP addresses and routes were getting configured on two interfaces.
Instead of just enp1s0f1, it had a default route through both enp1s0f1 and eno1, sending half the packets the wrong way. I'm guessing this is due to !173 (merged) not setting the correct network_interface
.w
(IPv4 kept working because it doesn't have automatic route merging, unlike IPv6 which merges both into a multipath route.)