ingress-nginx: Upgrade to 0.16.2

ingress-nginx 0.16.2 (https://github.com/kubernetes/ingress-nginx/releases/tag/nginx-0.16.2)

This patch simplify ingress-nginx deployment by default deploy on
master, with customizable options; on the other hand, remove the
additional Ansible group "kube-ingress" and its k8s node label
injection.

Reference to https://kubernetes.io/docs/concepts/services-networking/ingress/#prerequisites:

    GCE/Google Kubernetes Engine deploys an ingress controller on the master.

By changing `ingress_nginx_nodeselector` plus custom k8s node
label, user could customize the DaemonSet deployment target.

If `ingress_nginx_nodeselector` is empty, will deploy DaemonSet on
every k8s node.

roles/kubernetes-apps/ingress_controller/ingress_nginx/templates/deploy-default-backend.yml.j2

@@ -0,0 +1,44 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: default-backend-v{{ ingress_nginx_default_backend_image_tag }}
+  namespace: {{ ingress_nginx_namespace }}
+  labels:
+    k8s-app: default-backend
+    version: v{{ ingress_nginx_default_backend_image_tag }}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      k8s-app: default-backend
+      version: v{{ ingress_nginx_default_backend_image_tag }}
+  template:
+    metadata:
+      labels:
+        k8s-app: default-backend
+        version: v{{ ingress_nginx_default_backend_image_tag }}
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+        - name: default-backend
+          # Any image is permissible as long as:
+          # 1. It serves a 404 page at /
+          # 2. It serves 200 on a /healthz endpoint
+          image: {{ ingress_nginx_default_backend_image_repo }}:{{ ingress_nginx_default_backend_image_tag }}
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 8080
+              scheme: HTTP
+            initialDelaySeconds: 30
+            timeoutSeconds: 5
+          ports:
+            - containerPort: 8080
+          resources:
+            limits:
+              cpu: 10m
+              memory: 20Mi
+            requests:
+              cpu: 10m
+              memory: 20Mi