Add support for k8s v1.16.0-beta.2 (#5148)

Cleaned up deprecated APIs:
apps/v1beta1
apps/v1beta2
extensions/v1beta1 for ds,deploy,rs

Add workaround for deploying helm using incompatible
deployment manifest.
Change-Id: I78b36741348f47a999df3841ee63cf4e6f377830

roles/kubernetes-apps/ansible/templates/coredns-deployment.yml.j2

@@ -1,5 +1,5 @@
 ---
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: "coredns{{ coredns_ordinal_suffix }}"

roles/kubernetes-apps/ansible/templates/netchecker-agent-ds.yml.j2

@@ -1,4 +1,4 @@
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: DaemonSet
 metadata:
   labels:
@@ -6,6 +6,9 @@ metadata:
   name: netchecker-agent
   namespace: {{ netcheck_namespace }}
 spec:
+  selector:
+    matchLabels:
+      app: netchecker-agent
   template:
     metadata:
       name: netchecker-agent

roles/kubernetes-apps/ansible/templates/netchecker-agent-hostnet-ds.yml.j2

@@ -1,4 +1,4 @@
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: DaemonSet
 metadata:
   labels:
@@ -6,6 +6,9 @@ metadata:
   name: netchecker-agent-hostnet
   namespace: {{ netcheck_namespace }}
 spec:
+  selector:
+    matchLabels:
+      app: netchecker-agent-hostnet
   template:
     metadata:
       name: netchecker-agent-hostnet

roles/kubernetes-apps/ansible/templates/netchecker-server-deployment.yml.j2

@@ -1,15 +1,20 @@
-apiVersion: apps/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: netchecker-server
+  namespace: {{ netcheck_namespace }}
+  labels:
+    app: netchecker-server
 spec:
   replicas: 1
+  selector:
+    matchLabels:
+      app: netchecker-server
   template:
     metadata:
       name: netchecker-server
       labels:
         app: netchecker-server
-      namespace: {{ netcheck_namespace }}
     spec:
       priorityClassName: {% if netcheck_namespace == 'kube-system' %}system-cluster-critical{% else %}k8s-cluster-critical{% endif %}{{''}}
       containers: