[issue1367711] Remove usage of UserDict from os.py

[Raymond Hettinger]

Raymond Hettinger added the comment:

I don't think the point of this patch is worth doing.  The existing 
code is not buggy and runs fine.  Subclassing from dict increases the 
likelihood that an error will be introduced either now or in the future 
as the dict object evolves.  Recommend this be closed.

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nosy: +rhettinger

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