Comment 2 for bug 1595965

In http://docs.openstack.org/developer/oslo.messaging/transport.html

Username and password should be specified for each host, in case of lack of specification they will be omitted:

user:pass@host1:port1,host2:port2

[
  {"username": "user", "password": "pass", "host": "host1:port1"},
  {"host": "host2:port2"}
]

I doesn't mean the server is ommited , but username/password are ommited. so It works as design.

We can make it more clear about this, maybe a warning is logged in this case.