hgweb: replace PATH_INFO with dispatchpath
This was the last consumer of wsgireq.env from our WSGI applications!
(Although indirect consumers of this attribute exist in
wsgirequest.respond().)
Differential Revision: https://phab.mercurial-scm.org/D2825
from __future__ import absolute_importimport pkgutil__path__ = pkgutil.extend_path(__path__, __name__)