Kubernetes release v1.8.3

Based on https://github.com/kubernetes/kubernetes/releases/tag/v1.8.3
Merge pull request #54026 from liggitt/automated-cherry-pick-of-#54006-upstream-release-1.8

Automatic merge from submit-queue.

Automated cherry pick of #54006

Cherry pick of #54006 on release-1.8.

#54006: start generating rbac serialization for v1

```release-note
Fixes RBAC/v1 protobuf descriptor
```

Kubernetes-commit: fcb7486b335071e9474a8a78ed533ac5fea79675
tree: 0515ccf060ad74d56bcc20226e017fef9b707e79
  1. admission/
  2. admissionregistration/
  3. apps/
  4. authentication/
  5. authorization/
  6. autoscaling/
  7. batch/
  8. certificates/
  9. core/
  10. extensions/
  11. Godeps/
  12. imagepolicy/
  13. networking/
  14. policy/
  15. rbac/
  16. scheduling/
  17. settings/
  18. storage/
  19. LICENSE
  20. OWNERS
  21. README.md
README.md

This repo is still in the experimental stage. Shortly it will contain the schema of the API that are served by the Kubernetes apiserver.