bundle-spec: properly parse boolean configuration as boolean
Before this changesets "v2;revbranchcache=no" would actually request the
addition for a revbranchcache part as the non-empty string `"0"` is `True`
# __init__.py - Startup and module loading logic for Mercurial.
#
# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
# Allow 'from mercurial import demandimport' to keep working.
import hgdemandimport
demandimport = hgdemandimport