remove kube-dns versions and images in kubernetes-apps/ansible/defaults/main.yaml (#1807)

roles/kubernetes-apps/ansible/defaults/main.yml

 ---
-# Versions
-kubedns_version: 1.14.2
-kubednsautoscaler_version: 1.1.1
-
 # Limits for dnsmasq/kubedns apps
 dns_memory_limit: 170Mi
 dns_cpu_requests: 100m
@@ -10,16 +6,6 @@ dns_memory_requests: 70Mi
 kubedns_min_replicas: 2
 kubedns_nodes_per_replica: 10
 
-# Images
-kubedns_image_repo: "gcr.io/google_containers/k8s-dns-kube-dns-amd64"
-kubedns_image_tag: "{{ kubedns_version }}"
-dnsmasq_nanny_image_repo: "gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64"
-dnsmasq_nanny_image_tag: "{{ kubedns_version }}"
-dnsmasq_sidecar_image_repo: "gcr.io/google_containers/k8s-dns-sidecar-amd64"
-dnsmasq_sidecar_image_tag: "{{ kubedns_version }}"
-kubednsautoscaler_image_repo: "gcr.io/google_containers/cluster-proportional-autoscaler-amd64"
-kubednsautoscaler_image_tag: "{{ kubednsautoscaler_version }}"
-
 # Netchecker
 deploy_netchecker: false
 netchecker_port: 31081