[PATCH 02 of 10 py3] doc: port check-seclevel.py to be Python 2/3 portable

[Yuya Nishihara]

On Mon, 29 May 2017 10:32:24 -0400, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <raf at durin42.com>
> # Date 1496001086 14400
> #      Sun May 28 15:51:26 2017 -0400
> # Node ID 4991a75faad243e7b80a51bddc5e5a3d86989b3b
> # Parent  75e176c753d2c2c7eb5b5c0791bc993160fcb7b1
> doc: port check-seclevel.py to be Python 2/3 portable

Queued 2, 3, 6-9, thanks.