message: [test] Exit lldb-dotest in a more Pythonic way.
  As suggested by Keith Smiley in:
diff: @@ -12,7 +12,5 @@ if __name__ == '__main__':
  cmd = [dotest_path, '-q']
  cmd.extend(dotest_args)
  cmd.extend(wrapper_args)
  - # Invoke dotest.py
  - exit_code = subprocess.call(cmd)
  - if exit_code != 0:
  - sys.exit(exit_code)
  + # Invoke dotest.py and return exit code.
  + sys.exit(subprocess.call(cmd))
  