Fix the custom unpickler on Python 2.x.

Review Request #10559 — Created May 21, 2019 and submitted — Latest diff uploaded

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Django Evolution
master

Reviewers

The custom unpickler was previously only being used on newer versions
of Python and Django. However, a recent change resulted in it being
imported on Python 2.x as well, and it turns out that this wasn't
actually compatible on 2.x. We were making use of pickle._Unpickler
Python implementation as the parent class (Python 3.x exposes a native
implementation of the unpickler as Unpickler), while 2.x didn't have
this. Furthermore, we were calling super on it, which didn't work on
2.x in that Unpickler was an old-style class.

This fixes up the compatibility issues to work on both versions.

Unit tests pass on Python 2.x and 3.x.

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