devserver: start using payload scripts bundled with devserver

buildutil.py

 # Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os, sys
+
 class BuildObject(object):
   """
     Common base class that defines key paths in the source tree.
   """
   def __init__(self, root_dir, static_dir):
     self.app_id = "87efface-864d-49a5-9bb3-4b050a7c227a"
     self.root_dir = root_dir
-    self.scripts_dir = "%s/scripts" % self.root_dir
+    self.scripts_dir = "%s/src/scripts" % os.environ["CROS_WORKON_SRCROOT"]
+    self.devserver_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
     self.static_dir = static_dir
     self.x86_pkg_dir = "%s/build/x86/local_packages" % self.root_dir
 
   def AssertSystemCallSuccess(self, err, cmd="unknown"):
     """
       TODO(rtc): This code should probably live somewhere else.
     """
     if err != 0:
       raise Exception("%s failed to execute" % cmd)