Move error-toast up and make server details problems easy to see

appengine/swarming/ui/res/imp/botlist/bot-list.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <bot-list>
 
@@ skipping 10 matching lines @@
     None.
 
   Events:
     None.
 -->
 
 <link rel="import" href="/res/imp/bower_components/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="/res/imp/bower_components/polymer/polymer.html">
 
 <link rel="import" href="/res/imp/common/dynamic-table-behavior.html">
-<link rel="import" href="/res/imp/common/error-toast.html">
 <link rel="import" href="/res/imp/common/sort-toggle.html">
 <link rel="import" href="/res/imp/common/swarming-app.html">
 <link rel="import" href="/res/imp/common/url-param.html">
 <link rel="import" href="/res/imp/common/pageable-data.html">
 
 <link rel="import" href="bot-filters.html">
 <link rel="import" href="bot-list-data.html">
 <link rel="import" href="bot-list-shared-behavior.html">
 <link rel="import" href="bot-list-summary.html">
 
@@ skipping 194 matching lines @@
         </table>
         <pageable-data
           id="page_bots"
           busy="{{_busy2}}"
           label="Show more bots"
           output="{{_items}}"
           parse="[[_parseBots]]">
         </pageable-data>
       </div>
 
-      <error-toast></error-toast>
     </swarming-app>
 
   </template>
   <script>
   (function(){
     var UNKNOWN = "unknown";
     // see dynamic-table for more information on specialColumns, headerMap,
     // columnMap, and specialSort
     var specialColumns = ["id", "task", "cloud_console_link", "mp_lease_id"];
 
@@ skipping 418 matching lines @@
           return;
         }
         var url = "/api/swarming/v1/bots/list?" + sk.query.fromParamSet(this._query_params);
         this.$.page_bots.load(url,this._auth_headers);
       }
 
     });
   })();
   </script>
 </dom-module>