wireprotoserver: move error response handling out of hgweb The exception handler for ErrorResponse has more to do with the wire protocol than the generic HTTP server. Move the code so it lives alongside other wire protocol code. Differential Revision: https://phab.mercurial-scm.org/D2021

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