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/download/defaults/main.yml

@@ -157,7 +157,7 @@ local_volume_provisioner_image_tag: "v2.0.0"
 cephfs_provisioner_image_repo: "quay.io/external_storage/cephfs-provisioner"
 cephfs_provisioner_image_tag: "v1.1.0-k8s1.10"
 ingress_nginx_controller_image_repo: "quay.io/kubernetes-ingress-controller/nginx-ingress-controller"
-ingress_nginx_controller_image_tag: "0.15.0"
+ingress_nginx_controller_image_tag: "0.16.2"
 ingress_nginx_default_backend_image_repo: "gcr.io/google_containers/defaultbackend"
 ingress_nginx_default_backend_image_tag: "1.4"
 cert_manager_version: "v0.3.2"
@@ -564,7 +564,7 @@ downloads:
     tag: "{{ ingress_nginx_controller_image_tag }}"
     sha256: "{{ ingress_nginx_controller_digest_checksum|default(None) }}"
     groups:
-      - kube-ingress
+      - kube-node
   ingress_nginx_default_backend:
     enabled: "{{ ingress_nginx_enabled }}"
     container: true
@@ -572,7 +572,7 @@ downloads:
     tag: "{{ ingress_nginx_default_backend_image_tag }}"
     sha256: "{{ ingress_nginx_default_backend_digest_checksum|default(None) }}"
     groups:
-      - kube-ingress
+      - kube-node
   cert_manager_controller:
     enabled: "{{ cert_manager_enabled }}"
     container: true