Add UI for botlist to only display Machine Provider bots

appengine/swarming/ui/res/imp/botlist/bot-list-data.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-data>
 
@@ skipping 262 matching lines @@
         pMap["android_devices"] && pMap["android_devices"].push("0");
         pMap["device_os"] && pMap["device_os"].push("none");
         pMap["device_type"] && pMap["device_type"].push("none");
 
         pMap["id"] = [];
 
         // Create custom filter options
         pMap["disk_space"] = [];
         pMap["task"] = ["busy", "idle"];
         pMap["status"] = ["alive", "dead", "quarantined"];
+        pMap["is_mp_bot"] = ["true", "false"];
 
         // No need to sort any of this, bot-filters sorts secondary items
         // automatically, especially when the user types a query.
         return pMap;
       },
 
     });
   })();
   </script>
 </dom-module>