Comment 1 for bug 1362897

The issue will cause follow expection when end user what to launch a instance with trust falvor, that means, no instance can be launched in the cluster if we follow the manual and do nothing changes on it.

...
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher cert_file=cert_file)
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher File "/usr/lib/python2.7/httplib.py", line 1164, in __init__
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher source_address)
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher File "/usr/lib/python2.7/httplib.py", line 704, in __init__
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher self._set_hostport(host, port)
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher File "/usr/lib/python2.7/httplib.py", line 723, in _set_hostport
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher i = host.rfind(':')
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher AttributeError: 'NoneType' object has no attribute 'rfind'
2014-08-29 02:37:59.805 TRACE oslo.messaging.rpc.dispatcher
...