[PATCH 06 of 11 py3] util: use '\\' rather than using r'\'

[Yuya Nishihara]

On Sun, 09 Oct 2016 10:16:48 -0400, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1476018047 14400
> #      Sun Oct 09 09:00:47 2016 -0400
> # Node ID 88a5fecb60831eea7c44c6d6025ee23513528501
> # Parent  db2eae3cd5db193cd8922e93df2c6120ca9d7340
> util: use '\\' rather than using r'\'

Queued this, thanks.