Move GardeningServer out of BuildSlaveSupport

Tools/GardeningServer/scripts/WebKitBuildbot.js

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
         if (!match)
             return null;
         return {
             revision: parseInt(match[1], 10),
             buildNumber: parseInt(match[2], 10),
         };
     },
 };
 
 WebKitBuildbot.prototype.__proto__ = Buildbot.prototype;