--kube-certificate-file unknown

The option `--kube-certificate-file` mentioned in the [Kubernetes section](https://github.com/citrix/nitrox/blob/master/kubernetes/README.md) is unknown by Nitrox. Instead, [main.py](https://github.com/citrix/nitrox/blob/master/main.py) knows a `--kube-certificate-authority` option. Does it take the CA certificate file?