message: Calculate tink_root_path() in Python in a similar way as in Java and Go.
diff: @@ -46,9 +46,8 @@ def tink_root_path() -> Text:
  if 'TEST_SRCDIR' in os.environ:
  # Bazel enviroment
  root_paths.append(os.path.join(os.environ['TEST_SRCDIR'], 'tink_base'))
  - # try to calculate the path relative to the __file__ path.
  - root_paths.append(os.path.dirname(os.path.dirname(os.path.dirname(
  - os.path.dirname(os.path.abspath(__file__))))))
  + root_paths.append(os.path.join(os.environ['TEST_SRCDIR'],
  + 'google3/third_party/tink'))
  for root_path in root_paths:
  # return the first root path that exists.
  if os.path.exists(root_path):
  