add option '--nat-outgoing' for calico on clouds

roles/network_plugin/tasks/calico.yml

@@ -27,7 +27,7 @@
   run_once: true
 
 - name: Calico | Configure calico network pool for cloud
-  command: "calicoctl pool add {{ kube_pods_subnet }} --ipip"
+  command: "calicoctl pool add {{ kube_pods_subnet }} --ipip --nat-outgoing"
   run_once: true
   when: calico_conf.status == 404 and cloud_provider is defined and cloud_provider == True