Implement python 2 compatibility checks

We have been stuck on pylint <2 for a long time now because it dropped
some of the python 2 lints we rely on. We maintain compatibility with
python 2.6+ and 3.5+ and a lack of lints makes especially the former
much harder. Incompatibilities had already snuck in in the form of
implicit format specs. By implementing a custom checker we can make sure
this doesn't happen again.

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