GUAC-932: Begin migration of admin to new guacGroupList. Remove unused util module.

guacamole/src/main/webapp/app/manage/manageModule.js

@@ -23,5 +23,5 @@
 /**
  * The module for the administration functionality.
  */
-angular.module('manage', ['btford.modal', 'groupList', 'rest', 'util']);
+angular.module('manage', ['btford.modal', 'groupList', 'rest']);