[PATCH RFC v10] scmutil: add a simple key-value file helper

[Augie Fackler]

On Fri, Feb 03, 2017 at 02:47:26AM -0800, Kostia Balytskyi wrote:
> # HG changeset patch
> # User Kostia Balytskyi <ikostia at fb.com>
> # Date 1484824655 28800
> #      Thu Jan 19 03:17:35 2017 -0800
> # Node ID 19a449c91ef14e691cf1347748473e0094fedc86
> # Parent  9f264adbe75bfae8551dc0e6e0fce8d43fc7b43a
> scmutil: add a simple key-value file helper

(Also, protip: it was confusing to me to get this as an RFC but then
have other substantive work that's not RFC depend on it, because I
typically put RFCs at the bottom of my priority queue. Not sure if
others work that way or not....)