bundlerepo: use suffix variable
It looks like the refactor in 702a26fec3e2 attempted to establish
this method argument but failed to use it. My editor caught it.
Differential Revision: https://phab.mercurial-scm.org/D1373
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)