Merge pull request #491 from kubespray/calicopools

Allow calico to configure pool if tree exists, but no pools defined

roles/network_plugin/calico/tasks/main.yml

@@ -90,7 +90,7 @@
   environment:
     NO_DEFAULT_POOLS: true
   run_once: true
-  when: calico_conf.status == 404
+  when: calico_conf.status == 404 or "nodes" not in calico_conf.content
 
 - name: Calico | Get calico configuration from etcd
   uri: