Automatic merge from submit-queue Bumped Heapster to v1.2.0 ```release-note Bumped Heapster to v1.2.0. More details about the release https://github.com/kubernetes/heapster/releases/tag/v1.2.0 ``` Version `v1.2.0` is a stable release of the previous release candidate `v1.2.0-beta.3`. The only difference is bumped Kubernetes deps to the lastest stable release `v1.4.0-beta.3` https://github.com/kubernetes/heapster/pull/1290. It's low risk change. It may impact HPA and Monitoring e2e tests.