Merge branch 'winh-karma-suppress-vue-tips' into 'master'

Suppress Vue tips when running Karma

See merge request !12379

spec/javascripts/test_bundle.js

@@ -7,6 +7,10 @@ import '~/commons';
 import Vue from 'vue';
 import VueResource from 'vue-resource';
 
+const isHeadlessChrome = /\bHeadlessChrome\//.test(navigator.userAgent);
+Vue.config.devtools = !isHeadlessChrome;
+Vue.config.productionTip = false;
+
 Vue.use(VueResource);
 
 // enable test fixtures