handle Service Close request correctly (closes #736039) The windows event self._stop_event was not used, and twisted was not getting a chance of terminating cleanly by calling its shutdown event handlers (which would eventually call pyro_unregister). Fixed by calling reactor.stop()

"""server side objects

:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""