hgext/__init__.py

serve: simply return instead of calling sys.exit() in `hg serve --stdio`

The shouldn't be a reason to call `sys.exit()` instead of letting the
code return normally. I've remove the call in both `hg serve` and `hg
debugserve`.

Differential Revision: https://phab.mercurial-scm.org/D9271

from __future__ import absolute_import
import pkgutil

__path__ = pkgutil.extend_path(__path__, __name__)