Remove the requirement "--kubelet-arg="node-ip=" in dualStack

[manuelbuil]

Is your feature request related to a problem? Please describe.

As explained here: https://docs.k3s.io/installation/network-options#dual-stack-ipv4--ipv6-networking, when not using the default interface and being in dualStack mode, we require to pass the node-ip flag to kubelet. This is a problem in Kubelet which is being solved by this: https://github.com/kubernetes/enhancements/issues/3705.

Once it is fixed, we should:

• Verify that it works
• Update docs

Describe the solution you'd like

Being able to deploy k3s:

• In dualStack mode
• In a node with multiple NICs
• Using the non-default NIC for k3s inter-node communication

and not having to add the kubelet-arg=node-ip option

Describe alternatives you've considered

Additional context

[manuelbuil]

Still not fixed in upstream. We should track it here

[manuelbuil]

I think this is fixed

[rbrtbnfgl]

Yes