tests: use byte literals in test-storage.py
This fixes a Python 3 breakage due to unknown key due to str/bytes type
mismatch.
# skip-blame just b'' literals
Differential Revision: https://phab.mercurial-scm.org/D5114
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)