[PATCH 3 of 3] tests: use system hg only if changelog or dirstate can't be read

[Matt Harbison]

On Sun, 02 Jul 2017 03:12:06 -0400, Yuya Nishihara <yuya at tcha.org> wrote:

> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1498969463 -32400
> #      Sun Jul 02 13:24:23 2017 +0900
> # Node ID a36d466ffd600fa710fcd7444a7a5d4311e71a46
> # Parent  cd11e4cb52da6e5ab6cd73249b81e25e98e46009
> tests: use system hg only if changelog or dirstate can't be read

This series cleared up the errors for me, thanks.