Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md.
cloud-ctrl-mgr: enable secure port 10258
This PR enables authn+authz (delegated to the kube-apiserver) and the secure port 10258 for the cloud-controller-manager. In addition, the insecure port is disabled.
This is the counterpart PR to https://github.com/kubernetes/kubernetes/pull/64149.
Moreover, it adds integration test coverage for the `--port` and `--secure-port` flags, plus the testserver infrastructure to tests flags in general inside integration tests.
```release-note
Enable secure serving on port 10258 to cloud-controller-manager (configurable via `--secure-port`). Delegated authentication and authorization have to be configured like for aggregated API servers.
```
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