[issue16353] add function to os module for getting path to default shell

[Taras Lyapun]

Taras Lyapun added the comment:

Updated patch.
Moved function to os and used Christian Heimes implementation.
Updated doc, and test.
Also renamed function to get_shell.

Test passes on mac os and windows.

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Added file: http://bugs.python.org/file27897/issue16353.diff

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