Medium sized improvements to bot-list and task-list

appengine/swarming/elements/res/imp/common/common-behavior.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.
 
   It contains the definition of the following Behaviors:
 
     SwarmingBehaviors.CommonBehavior
 
   To use it, include
@@ skipping 22 matching lines @@
       // filters should be an array of {key:String, value:String} and
       // columns should be an array of Strings.
       _botListLink: function(filters, columns) {
         filters = filters || [];
         columns = columns || [];
         var fArr = [];
         filters.forEach(function(f){
           fArr.push(f.key + ":" + f.value);
         });
         var obj = {
-          filters: fArr,
-          columns: columns,
+          f: fArr,
+          c: columns,
         }
         return "/newui/botlist?" + sk.query.fromParamSet(obj);
       },
 
       // _getJsonAsync makes an XHR to a url, parses the response as JSON
       // and sticks the resulting object into the property with the name given
       // by "bindTo". If busy is defined, the property with that name will be
       // set to true while the request is in flight and false afterwards.
       // request headers (e.g. authentication) and query params will be used if
       // provided. Query params is an object like {String:Array<String>}. On
@@ skipping 77 matching lines @@
           return "eons";
         }
         if (!second) {
           second = new Date();
         }
         return this._humanDuration((second.getTime() - first.getTime())/1000);
       },
     };
   })();
 </script>