remotefilelog: tweak corrupt cache test to grep more flexibly
I'm about to fix the abuse of RuntimeError here, which breaks the test
if I don't do this.
Differential Revision: https://phab.mercurial-scm.org/D11005
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)