Add link to old ui back in

appengine/swarming/templates/root.html

 {% extends "swarming/base.html" %}
 
 
 {% block headers %}
 <script src="/third_party/webcomponentsjs/webcomponents.min.js"></script>
 <link rel="import" href="/ui/polymer05/stats-overview-build.html">
 <style>
   .highlight_section {
     background-color: #ffffee;
     border-radius: 20px;
@@ skipping 54 matching lines @@
 
     {% if user_type %}
     As a {{user_type}}, you are entitled to see these pages:
     {% else %}
     Please <a href="{{signin_link|safe}}">sign in</a> for more access.
     {% endif %}
 
     <h3>Service Status</h3>
     <ul>
       <li class="user"><a href="/stats">Usage statistics</a></li>
-      <li class="user"><a href="/user/tasks">Tasks</a></li>
-      <li class="privileged_user"><a href="/restricted/bots">Bots</a></li>
+      <li class="user"><a href="/oldui/user/tasks">Tasks</a></li>
+      <li class="privileged_user"><a href="/oldui/restricted/bots">Bots</a></li>
       <li class="admin"><a href="/restricted/ereporter2/report">Exceptions in server log</a></li>
       <li class="admin"><a href="/restricted/ereporter2/errors">Ereporter2 errors</a></li>
       <li class="admin"><a href="/restricted/mapreduce/status">Map reduce jobs</a></li>
       <li class="admin">
         <a href="https://console.cloud.google.com/appengine?project={{app_id|utf8}}&versionId={{app_version|utf8}}&duration=P2D&graph=AE_INSTANCES">View instances on AppEngine</a>
       </li>
       <li class="admin">
         <a href="https://console.cloud.google.com/appengine?project={{app_id|utf8}}&versionId={{app_version|utf8}}&duration=P2D&graph=AE_ERROR_DETAILS">View HTTP 4xx/5xx on AppEngine</a>
       </li>
     </ul>
@@ skipping 52 matching lines @@
           <input type="hidden" name="xsrf_token" value="{{xsrf_token}}" />
           <button type="submit" {%if not is_admin%}disabled{%endif%}>Cancel all pending tasks</button>
         </form>
       </li>
     </ul>
   </div>
   <stats-overview flex></stats-overview>
 </div>
 
 {% endblock %}