[issue14626] os module: use keyword-only arguments for dir_fd and nofollow to reduce function count

[Arfrever Frehtes Taifersar Arahesis]

Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA at GMail.Com> added the comment:

Previously existing redundant functions could be deprecated in documentation.

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<http://bugs.python.org/issue14626>
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