[PATCH] [libc++] Refactor test components into modules.

[Dan Albert]

In http://reviews.llvm.org/D6881#106444, @EricWF wrote:

> I would like to see the test module go into a directory by itself. Should this directory live in libcxx/utils or libcxx/test?
>  What should we name the module? I like `LibcxxTest`.
>
> Once `testconfig.py` and `testformat.py` live in a subdirectory can we drop the `test` prefix?


I had considered using `libcxx.test.format`/`libcxx.test.config`. I was sort of leaning toward that anyway. I'll make the change.


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http://reviews.llvm.org/D6881

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