Add crsf token in axios calls

app/assets/javascripts/clusters.js

 /* globals Flash */
 import Visibility from 'visibilityjs';
 import axios from 'axios';
+import setAxiosCsrfToken from './lib/utils/axios_utils';
 import Poll from './lib/utils/poll';
 import { s__ } from './locale';
 import initSettingsPanels from './settings_panels';
@@ -17,6 +18,7 @@ import Flash from './flash';
 class ClusterService {
   constructor(options = {}) {
     this.options = options;
+    setAxiosCsrfToken();
   }
   fetchData() {
     return axios.get(this.options.endpoint);

app/assets/javascripts/lib/utils/axios_utils.js

+import axios from 'axios';
+import csrf from './csrf';
+
+export default function setAxiosCsrfToken() {
+  axios.defaults.headers.common[csrf.headerKey] = csrf.token;
+}