Refactoring of *.test.mk

[Simon J. Gerraty]

On Tue, 15 Oct 2013 09:54:14 -0400, Julio Merino writes:
>I suspect that with 10 branched, we don't need approval from re@ for
>submission at this point; is that correct?

head was restricted until yesterday I think.

>That said, I think it's worth to merge this into 10 (now or after
>release, doesn't matter much). Given that this touches yet-unused
>files, it shouldn't be a major concern for re at . The reason for merging
>into 10 is that it'd be nice if any future tests written in HEAD for
>regressions encountered in 10 could be pulled up into the branch with
>ease along the actual fixes.

Sounds reasonable.