Merge release1.15 into master (#16535)

* initial commit

* promote AWS-NLB Support from alpha to beta (#14451) (#16459) (#16484)

* 1. Sync release-1.15 into master
2. Sync with en version

* 1. Add the lost yaml file.

* Update he cluster administration folder of concepts
1. Sync with 1.14 branch
2. Sync with en version

* Add yaml files which are used

content/zh/examples/application/nginx-app.yaml

@@ -0,0 +1,34 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: my-nginx-svc
+  labels:
+    app: nginx
+spec:
+  type: LoadBalancer
+  ports:
+  - port: 80
+  selector:
+    app: nginx
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: my-nginx
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.7.9
+        ports:
+        - containerPort: 80