tests: add some re and globs for test-revset on python3
At this point we're down to two deprecation warnings (which I suspect
are showing a bug in the test?) and one weird-looking failure. Progress!
Differential Revision: https://phab.mercurial-scm.org/D2559
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)