[issue24231] os.makedirs('/', exist_ok=True) fails on Darwin

[Ned Deily]

Ned Deily added the comment:

This appears to be a BSD-ism: I get the same result on FreeBSD 10 as with OS X 10.10.  For whatever reason, mkdir('/') returns IsADirectoryError while mkdir('/other/existing/directory') returns FileExistsError.

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nosy: +ned.deily
stage:  -> needs patch
versions: +Python 3.5

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<http://bugs.python.org/issue24231>
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