tests: add more tests around hook output and getbundle
The previous tests around hook output only tested Python hooks. Let's
add some shell hooks in for additional test coverage.
Differential Revision: https://phab.mercurial-scm.org/D2550
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)