2 ipv6 only compatiblility

[oliverwelter]

Provides a configuration example and changes for setting up an IPv6 only kubernetes cluster.

[oliverwelter]

Hi @geerlingguy ,
I wanted to check if there is anything I can do to move forward with this pull request? This one contains only smaller adjustments for IPv6 only compatibility, but I have another set of changes in the pipeline (https://github.com/opencorp-projects/ansible-role-kubernetes/tree/3-control-plane-with-several-nodes) allowing to setup and join additional control plane nodes which is based on this pull request. To avoid merge complexity I want to wait with creating another pull request until this one is resolved. Any feedback would be very much appreciated.

Best,
Oliver