[PATCH 2 of 5] tests: clarify demandimport disabled state

[Pierre-Yves David]

On 09/21/2016 05:59 AM, timeless wrote:
> # HG changeset patch
> # User timeless <timeless at mozdev.org>
> # Date 1474429177 0
> #      Wed Sep 21 03:39:37 2016 +0000
> # Node ID 982fe7cdb28bb263a96b1bc2c9c3b8aedb025ab6
> # Parent  24d85146985b7d2fef3c27b97d4be983e57ae5c7
> # Available At https://bitbucket.org/timeless/mercurial-crew
> #              hg pull https://bitbucket.org/timeless/mercurial-crew -r 982fe7cdb28b
> tests: clarify demandimport disabled state

I've pushed the first two as obviously correct. Can you add some longer 
description and docstring to the other 3 so that I can get a grasp of 
what is going on.

Cheers,

-- 
Pierre-Yves David