Kubernetes-commit: 1c424fddc2a564588fc5b32731cf4c0e52f86ef7
Kubernetes-commit: 195547f872c288f5b81e436be6bd1f0feade5315
Also add authenticate- prefix to auth samples. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com> Kubernetes-commit: 62d1251874cb259d38d727300ac4b2646c4122c8