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

[Eric Fiselier]

Whooo! I'm super happy to see this patch! Lets do some bike-shedding!

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?


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  rL LLVM

http://reviews.llvm.org/D6881

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