auth_service: Fetch revisions of all configs (for UI) at once.

appengine/auth_service/templates/config.html

 {% extends 'auth/base.html' %}
 {% block content %}
 
 {% set is_readonly = auth_service_config_locked or not is_admin %}
 <div class="row">
   <div class="col-md-12">
     <div class="panel panel-default">
       <div class="panel-heading">
         <h3 class="panel-title">Group import configuration</h3>
       </div>
       <div class="panel-body">
         <div id="import-config-alerts"></div>
         <form class="form" role="form" id="import-config">
           <div class="form-group">
             <textarea class="form-control"
                       style="font-family:monospace;"
                       rows="20"
                       name="config"
                       {% if is_readonly %}readonly{% endif %}
                       wrap="off"></textarea>
           </div>
           <div class="form-group">
             {% if auth_service_config_locked %}
-              {{ render_config_locked() }}
+              {{ render_config_locked("imports.cfg") }}
             {% else %}
               {% if is_admin %}
                 <button type="submit" class="btn btn-primary">Save</button>
               {% endif %}
             {% endif %}
           </div>
          </form>
       </div>
     </div>
   </div>
 </div>
 
 {% endblock content %}