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.

inventory/sample/group_vars/k8s-cluster.yml

@@ -208,6 +208,8 @@ cephfs_provisioner_enabled: false
 # Nginx ingress controller deployment
 ingress_nginx_enabled: false
 # ingress_nginx_host_network: false
+# ingress_nginx_nodeselector:
+#   node-role.kubernetes.io/master: "true"
 # ingress_nginx_namespace: "ingress-nginx"
 # ingress_nginx_insecure_port: 80
 # ingress_nginx_secure_port: 443

inventory/sample/hosts.ini

@@ -26,11 +26,6 @@
 # node5
 # node6
 
-# [kube-ingress]
-# node2
-# node3
-
 # [k8s-cluster:children]
 # kube-master
 # kube-node
-# kube-ingress