Enable DNS AutoScaler for CoreDNS (#3707)

* Enable AutoScaler for CoreDNS

* Only use one template for dns autoscaler

* Rename a few variables for replicas and minimum pods

* Rename a few variables for replicas and minimum pods

* Remove replicas to make autoscale work

* Cleanup kubedns-autoscaler as it has been renamed

roles/kubernetes-apps/ansible/tasks/cleanup_dns.yml

@@ -54,3 +54,13 @@
     - kubeadm_init is defined
     - kubeadm_init.changed|default(false)
     - inventory_hostname == groups['kube-master'][0]
+
+- name: Kubernetes Apps | Delete old KubeDNS Autoscaler deployment
+  kube:
+    name: "kubedns-autoscaler"
+    namespace: "kube-system"
+    kubectl: "{{ bin_dir }}/kubectl"
+    resource: "deploy"
+    state: absent
+  tags:
+    - upgrade