`kubectl get` supports specifying a comma separated list of resource types. E.g.:
```bash
kubectl get pods,secrets
```
Will list all pods and secrets in the current namespace.
This commit adds support to the kubectl bash completion for this feature. Which means if you type `kubectl get pods,sec<tab>` it will be auto-completed to `kubectl get pods,secrets` (assuming the cluster does not have a CRD starting with `sec`).
Kubernetes-commit: 51671ecc2e258d50c7b1315b7b68c4e239f7e829
Sean Sullivan
Philipp Stehle
xiongzhongliang
Maciej Szulik