root@cssos-dev-ci:/var/run# zuul-server -d
Traceback (most recent call last):
  File "/usr/local/bin/zuul-server", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/zuul/cmd/server.py", line 239, in main
    server.main()
  File "/usr/local/lib/python2.7/dist-packages/zuul/cmd/server.py", line 199, in main
    self.sched.reconfigure(self.config)
  File "/usr/local/lib/python2.7/dist-packages/zuul/scheduler.py", line 576, in reconfigure
    event.wait()
  File "/usr/local/lib/python2.7/dist-packages/zuul/scheduler.py", line 882, in process_management_queue
    self._doReconfigureEvent(event)
  File "/usr/local/lib/python2.7/dist-packages/zuul/scheduler.py", line 664, in _doReconfigureEvent
    self.config.get('zuul', 'layout_config'))
  File "/usr/local/lib/python2.7/dist-packages/zuul/scheduler.py", line 420, in _parseConfig
    raise Exception("Unable to find function %s" % fname)
Exception: Unable to find function single_use_node
/usr/local/lib/python2.7/dist-packages/paramiko/client.py:684: UserWarning: Unknown ssh-rsa host key for [repomaster.3pardata.com]:29418: f86738d57bbd58b1d12bdf954d6a82f8
  (key.get_name(), hostname, hexlify(key.get_fingerprint())))