Automatic merge from submit-queue (batch tested with PRs 39673, 39536, 39617, 39540, 39686)

kubeadm: updated DNS deployment.

**What this PR does / why we need it**: Updates KubeDNS deployment to match upstream.

**Special notes for your reviewer**: It was tested manually by bootstrapping a new cluster, running a busybox container and making sure one could `nslookup` from within the container to find `kubernetes` and other services.