[PATCH 1 of 2 v2] run-tests: report path for tests outside current directory

[Yuya Nishihara]

On Tue, 22 Mar 2016 00:05:42 -0500, timeless wrote:
> # HG changeset patch
> # User timeless <timeless at mozdev.org>
> # Date 1456431250 0
> #      Thu Feb 25 20:14:10 2016 +0000
> # Node ID 432352f451d0eb4ece052ffebdf3c18b02cc89ec
> # Parent  78e4e558fa74aa4489609953328cbcecf1a8a428
> run-tests: report path for tests outside current directory

It appears that absolute path is reported for the tests "inside" the current
directory. Is that intended? I think that is unnecessarily verbose.

> -  Failed test-failure.t: output changed
> -  Failed test-failure-unicode.t: output changed
> +  Failed $TESTTMP/test-failure.t: output changed
> +  Failed $TESTTMP/test-failure-unicode.t: output changed