We will continue to accept the kops/v1alphaN format, but we rewrite it
(via string manipulation) to kops.k8s.io/v1alphaN.
This allows us to register the kops types as CRDs, which in turn
should enable kops server to work without API aggregation, and also
reduce our dependencies on less-stable API machinery.
We don't call klog.InitFlags yet, because that will cause a flag
redefinition error until we get everyone to stop using glog. That
will happen when we update to k8s 1.13.