Add losing placeholder to instantiate template

src/sunstone/public/app/tabs/templates-tab/form-panels/instantiate.js

@@ -167,6 +167,7 @@ define(function(require) {
     var idsLength = this.selected_nodes.length;
     var idsDone = 0;
 
+    templatesContext.html("");
     $.each(this.selected_nodes, function(index, template_id) {
       OpenNebulaTemplate.show({
         data : {

src/sunstone/public/app/tabs/templates-tab/form-panels/instantiate/html.hbs

@@ -50,6 +50,10 @@
   </div>
   <div class="row">
     <div class="large-12 large-centered columns list_of_templates">
+      <span class="fa-stack fa-5x">
+        <i class="fa fa-cloud fa-stack-2x"></i>
+        <i class="fa  fa-spinner fa-spin fa-stack-1x fa-inverse"></i>
+      </span>
     </div>
   </div>
 </form>