Extend configuration with:
```
set service kubelet role <control/node/control-node>
set service kubelet join host <control plane host>
set service kubelet join token <token>
set service kubelet join discovery-token-ca-cert-hash <hash>
set service kubelet join certificate-key <key>
```
Open Questions:
- Keeping join Information after actually joining, especially since it is invalidating after certain time?
- Is there a better way to do this?