Comment 1 for bug 904560

More information in nova-network.log:

(nova): TRACE: Traceback (most recent call last):
(nova): TRACE: File "/usr/bin/nova-network", line 49, in <module>
(nova): TRACE: service.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py", line 393, in wait
(nova): TRACE: _launcher.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py", line 113, in wait
(nova): TRACE: service.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 166, in wait
(nova): TRACE: return self._exit_event.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
(nova): TRACE: return hubs.get_hub().switch()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 177, in switch
(nova): TRACE: return self.greenlet.switch()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 192, in main
(nova): TRACE: result = function(*args, **kwargs)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py", line 83, in run_server
(nova): TRACE: server.start()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py", line 143, in start
(nova): TRACE: self.manager.init_host()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 1183, in init_host
(nova): TRACE: self.driver.ensure_metadata_ip()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/linux_net.py", line 445, in ensure_metadata_ip
(nova): TRACE: run_as_root=True, check_exit_code=False)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/linux_net.py", line 783, in _execute
(nova): TRACE: return utils.execute(*cmd, **kwargs)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 211, in execute
(nova): TRACE: if _returncode not in check_exit_code:
(nova): TRACE: TypeError: argument of type 'bool' is not iterable
(nova): TRACE:

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Looks like commit ed1b801a2cc3691cdab6ca2ae95f7299a964d00f is the cause here. (utils.execute was changed there)