Fix test262 harness to purge old data directory.

test/test262/testcfg.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 86 matching lines @@
             test = Test262TestCase(join(root, file), test_path, self.context,
                                    self.root, mode, harness)
             tests.append(test)
     return tests
 
   def DownloadData(self):
     revision = TEST_262_ARCHIVE_REVISION
     archive_url = TEST_262_URL % revision
     archive_name = join(self.root, 'test262-%s.tar.bz2' % revision)
     directory_name = join(self.root, 'data')
+    directory_old_name = join(self.root, 'data.old')
     if not exists(archive_name):
       print "Downloading test data from %s ..." % archive_url
       urllib.urlretrieve(archive_url, archive_name)
+      if exists(directory_name):
+        os.rename(directory_name, directory_old_name)
     if not exists(directory_name):
       print "Extracting test262-%s.tar.bz2 ..." % revision
       md5 = hashlib.md5()
       with open(archive_name,'rb') as f:
         for chunk in iter(lambda: f.read(8192), ''):
           md5.update(chunk)
       if md5.hexdigest() != TEST_262_ARCHIVE_MD5:
         os.remove(archive_name)
         raise Exception("Hash mismatch of test data file")
       archive = tarfile.open(archive_name, 'r:bz2')
       archive.extractall(join(self.root))
       os.rename(join(self.root, 'test262-%s' % revision), directory_name)
 
   def GetBuildRequirements(self):
     return ['d8']
 
   def GetTestStatus(self, sections, defs):
     status_file = join(self.root, 'test262.status')
     if exists(status_file):
       test.ReadConfigurationInto(status_file, sections, defs)
 
 
 def GetConfiguration(context, root):
   return Test262TestConfiguration(context, root)