Python 3 monkeypatched staticmethods cleanup improperly

[Andrew Laski]

The same issue fixed for Python 2 with https://github.com/testing-cabal/fixtures/commit/a66dc6828dcaab4751aaa97a7ab5590b8e0be343 exists for Python 3.

Commit message of Python 2 fix explaining the issue:

"As noticed by Antoni S. Puimedon in http://gerrit.ovirt.org/23378/, in Python
2, setattr(Class, name, func) automatically converts a function into an
instancemethod. To keep type(Class.func) as function, staticmethod(func) must
be applied explicitly."

[Andrew Laski (alaski)]

https://github.com/testing-cabal/fixtures/pull/23