D5207: tests: skip wireproto clientreactor tests on Python 3.6.0-3.6.3 inclusive

[Yuya Nishihara]

>  if __name__ == '__main__':
> +    if (3, 6, 0) <= sys.version_info <= (3, 6, 3):
> +        # Python 3.6.0 through 3.6.3 inclusive shipped with
> +        # https://bugs.python.org/issue31825 and we can't run these
> +        # tests on those specific versions of Python. Sigh.
> +        sys.exit(0)

Changed 0 to 80 to flag the test as skipped.