[issue17914] add os.cpu_count()

[Charles-François Natali]

Charles-François Natali added the comment:

> I think the idiom `os.cpu_count() or 1` should be mentioned in the documentation an officially recommended. Otherwise people will produce a non-portable code which works on their developer's computers but not on exotic platforms.

And I maintain it's an ugly idiom ;-)
Since the user can't do anything except falling back to 1,
os.cpu_count() should always return a positive number (1 by default).
That's AFAICT what all other platforms (Java, Ruby, etc) do, because
it makes sense.

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