hgext/__init__.py

narrow: avoid overwriting a variable

I don't like to overwrite variables, especially not with a different
type (because it makes it harder to explain what the variable is for,
and, therefore, to name it well).

Differential Revision: https://phab.mercurial-scm.org/D4846

from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)