Minor cleanups of CoreDNS issues and CI job (#4719)

* Minor cleanups

* Add comment in docs that nodelocaldns cache is enabled by default

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

@@ -7,6 +7,16 @@
     resource: "deploy"
     state: absent
   when:
-    - kubeadm_init is defined
-    - kubeadm_init.changed|default(false)
+    - dns_mode in ['coredns', 'coredns_dual']
+    - inventory_hostname == groups['kube-master'][0]
+
+- name: Kubernetes Apps | Delete kubeadm Kube-DNS service
+  kube:
+    name: "kube-dns"
+    namespace: "kube-system"
+    kubectl: "{{ bin_dir }}/kubectl"
+    resource: "svc"
+    state: absent
+  when:
+    - dns_mode in ['coredns', 'coredns_dual']
     - inventory_hostname == groups['kube-master'][0]

roles/kubernetes-apps/rotate_tokens/tasks/main.yml

@@ -34,7 +34,7 @@
     {{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf get secrets --all-namespaces
     -o 'jsonpath={range .items[*]}{"\n"}{.metadata.namespace}{" "}{.metadata.name}{" "}{.type}{end}'
     | grep kubernetes.io/service-account-token
-    | egrep 'default-token|kube-proxy|kube-dns|netchecker|weave|calico|canal|flannel|dashboard|cluster-proportional-autoscaler|tiller|local-volume-provisioner'
+    | egrep 'default-token|kube-proxy|coredns|netchecker|weave|calico|canal|flannel|dashboard|cluster-proportional-autoscaler|tiller|local-volume-provisioner'
   register: tokens_to_delete
   when: needs_rotation