heat engine won't start

Appears to be a regression caused by https://review.openstack.org/#/c/27389/

2013-04-29 13:28:14.479 2936 CRITICAL heat [-] no such option: host
2013-04-29 13:28:14.479 2936 TRACE heat Traceback (most recent call last):
2013-04-29 13:28:14.479 2936 TRACE heat File "/bin/heat-engine", line 5, in <module>
2013-04-29 13:28:14.479 2936 TRACE heat pkg_resources.run_script('heat==2013.2.a92.g5c58b5c', 'heat-engine')
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 499, in run_script
2013-04-29 13:28:14.479 2936 TRACE heat self.require(requires)[0].run_script(script_name, ns)
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1239, in run_script
2013-04-29 13:28:14.479 2936 TRACE heat execfile(script_filename, namespace, namespace)
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/heat-2013.2.a92.g5c58b5c-py2.7.egg/EGG-INFO/scripts/heat-engine", line 66, in <module>
2013-04-29 13:28:14.479 2936 TRACE heat srv = engine.EngineService(cfg.CONF.host, rpc_api.ENGINE_TOPIC)
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/oslo/config/cfg.py", line 1191, in __getattr__
2013-04-29 13:28:14.479 2936 TRACE heat return self._get(name)
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/oslo/config/cfg.py", line 1513, in _get
2013-04-29 13:28:14.479 2936 TRACE heat value = self._substitute(self._do_get(name, group))
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/oslo/config/cfg.py", line 1529, in _do_get
2013-04-29 13:28:14.479 2936 TRACE heat info = self._get_opt_info(name, group)
2013-04-29 13:28:14.479 2936 TRACE heat File "/usr/lib/python2.7/site-packages/oslo/config/cfg.py", line 1629, in _get_opt_info
2013-04-29 13:28:14.479 2936 TRACE heat raise NoSuchOptError(opt_name, group)
2013-04-29 13:28:14.479 2936 TRACE heat NoSuchOptError: no such option: host