New playbooks for k8s service and examples

- kubedns moved to playbooks dir
- new ansible playbooks added for kubedash and kube-dashboard
- examples for k8s deployments and services added

examples/kubernetes/external-nginx/nginx-backends.yaml

@@ -0,0 +1,24 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: nginx-backend
+spec:
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: nginx-backend
+        tier: backend
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        env:
+        - name: GET_HOSTS_FROM
+          value: dns
+        ports:
+        - containerPort: 80