This change allows to define two cluster CIDRs for compatibility with
Kubernetes dual-stuck, with an assumption that two CIDRs are usually
IPv4 and IPv6.

It does that by levearaging changes in out kube-router fork, with the
following downstream release:

https://github.com/k3s-io/kube-router/releases/tag/v1.3.2%2Bk3sSigned-off-by: Michal Rostecki <vadorovsky@gmail.com>