[issue15837] Added test to test_random.py testing Random.shuffle

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> This could be because of the many tests of whether the 2nd argument is None
> in the loop.

This is because Random._randbelow (and therefore randrange, randint) is 
relatively slow.

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<http://bugs.python.org/issue15837>
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