[issue27266] Always use getrandom() in os.random() on Linux and add block=False parameter to os.urandom()

[Donald Stufft]

Donald Stufft added the comment:

I also contest the idea that os functions must only be thin shells around system provided calls (even though I don't think that using getrandom instead of reading from /dev/urandom violates that assertion).

There are a number of functions in os.py that add additional logic ontop of the system calls, like:

* os.makedirs
* os.removedirs
* os.renames
* os.walk
* os.popen (which actually imports and uses the entire subprocess module)
* os.scandir

That's just from a quick scan of the pure Python os.py file.

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<http://bugs.python.org/issue27266>
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