Add extensibility point for suspension modal

app/assets/javascripts/admin/services/admin-tools.js.es6

@@ -28,6 +28,11 @@ export default Ember.Service.extend({
     };
   },
 
+  // Can be overridden to extend the modal contents if necessary
+  beforeControlModal() {
+    return Ember.RSVP.resolve();
+  },
+
   _showControlModal(type, user, opts) {
     opts = opts || {};
 
@@ -39,11 +44,11 @@ export default Ember.Service.extend({
       controller.set('post', opts.post);
     }
 
-    let promise = user.adminUserView ?
+    return this.beforeControlModal(controller).then(() => {
+      return user.adminUserView ?
         Ember.RSVP.resolve(user) :
         AdminUser.find(user.get('id'));
-
-    promise.then(loadedUser => {
+    }).then(loadedUser => {
       controller.setProperties({
         user: loadedUser,
         loadingUser: false,