Add hung bots to sheriff-o-matic view

Tools/GardeningServer/model/ct-trooper-failure-group-data.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <script>
 function CTTrooperFailureGroupData(details, url, raw, type, tree) {
   this.details = details;
   this.url = url;
   this.data = raw;
   this.type = type;
   this.tree = tree;
+  this.category = 'trooper';
 };
 
 CTTrooperFailureGroupData.prototype.getAnnotations = function() {
   return [];
 };
 
 CTTrooperFailureGroupData.prototype.dataToExamine = function() {
   return {url: this.url};
 };
 
 CTTrooperFailureGroupData.prototype.failureKeys = function() {
   return [];
 };
 </script>