Automatic merge from submit-queue Deploy kube-dns with cluster-proportional-autoscaler This PR integrates [cluster-proportional-autoscaler](https://github.com/kubernetes-incubator/cluster-proportional-autoscaler) with kube-dns for DNS horizontal autoscaling. Fixes #28648 and #27781.
Container-VM Image
Container-VM Image is a container-optimized OS image for the Google Cloud Platform (GCP). It is primarily for running Google services on GCP. Unlike the open preview version of container-vm, the new Container-VM Image is based on the open source ChromiumOS project, allowing us greater control over the build management, security compliance, and customizations for GCP.