WebhookAuthorizer's Authorize should send *all* the information
present in the user.Info data structure. We are not sending the
UID currently.
Kubernetes-commit: 9a761b16c1558106800222dbc52f6ab03c40c64c
change import of client-go/api/helper to kubernetes/api/helper
remove unnecessary use of client-go/api.registry
change use of client-go/pkg/util to kubernetes/pkg/util
remove dependency on client-go/pkg/apis/extensions
remove unnecessary invocation of k8s.io/client-go/extension/intsall
change use of k8s.io/client-go/pkg/apis/authentication to v1
Kubernetes-commit: c354076aa41e3cf417b291d5f0eff2b70395ac30