tests/test-check-interfaces.py.out

py3: port f to Python 3

This involved a lot of b'' literals, conversion from %s to %d, and
using a hashing mechanism that returns bytes instead of str.

Differential Revision: https://phab.mercurial-scm.org/D2299

public attributes not in abstract interface: badpeer.badattribute
public attributes not in abstract interface: badpeer.badmethod