upgrade example/walkthrough to v1beta3

examples/walkthrough/replication-controller.yaml

@@ -1,25 +1,24 @@
-id: nginx-controller
-apiVersion: v1beta1
+apiVersion: v1beta3
 kind: ReplicationController
-desiredState:
+metadata:
+  name: nginx-controller
+spec:
   replicas: 2
-  # replicaSelector identifies the set of Pods that this
+  # selector identifies the set of Pods that this
   # replicaController is responsible for managing
-  replicaSelector:
+  selector:
     name: nginx
   # podTemplate defines the 'cookie cutter' used for creating
   # new pods when necessary
-  podTemplate:
-    desiredState:
-      manifest:
-        version: v1beta1
-        id: nginx
-        containers:
-          - name: nginx
-            image: nginx
-            ports:
-              - containerPort: 80
-    # Important: these labels need to match the selector above
-    # The api server enforces this constraint.
-    labels:
-      name: nginx
+  template:
+    metadata:
+      labels:
+        # Important: these labels need to match the selector above
+        # The api server enforces this constraint.
+        name: nginx
+    spec:
+      containers:
+        - name: nginx
+          image: nginx
+          ports:
+            - containerPort: 80