apimachinery: remove pre-apigroups import prefix logic
apimachinery: remove pre-apigroups import prefix logic

Kubernetes-commit: 8728576236698083f619c4fab06943b174f3fc61

caesarxuchao/kube-aggregator,caesarxuchao/kube-aggregator,kubernetes/kube-aggregator,kubernetes/kube-aggregator,caesarxuchao/kube-aggregator