tests/test-check-interfaces.py.out

contrib: split Windows requirements into multiple files

Package support for Python 2 has diverged significantly. It is no
longer trivial to maintain a single requirements file that supports
both Python 2 and 3 because the set of packages and versions varies
wildly.

This commit split up the Windows requirements files so we have
variants for Python 2 and 3. As part of this, I also renamed the
files to have what I believe to be more reasonable naming ("win32"
felt like a weird identifier to me).

We can see that some package versions decreated on 2.7. This is
because the old pinned versions weren't compatible with Python 2.

public attribute not declared in interfaces: badpeer.badattribute
public attribute not declared in interfaces: badpeer.badmethod