[issue27186] add os.fspath()

[Roundup Robot]

New submission from Roundup Robot:

New changeset 59a52a9dd0dc by Ethan Furman in branch 'default':
issue27186 -- initial docs, tests, and python version of os.fspath
https://hg.python.org/cpython/rev/59a52a9dd0dc

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27186>
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