[issue20534] Enum tests fail with pickle protocol 4

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Pickle will prefer the __reduce_ex__() method over the __reduce__() method. If base class defined the __reduce_ex__() method, Enum.__reduce__() will be ignored.

> I left the test for test_subclasses_without_getnewargs alone as the point of that test is to make sure that _make_class_unpicklable is working properly, not to see if we can somehow get any of it to pickle.

Without these changes pickling failed, but not because _make_class_unpicklable.

I added other comments on Rietveld.

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<http://bugs.python.org/issue20534>
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