I think there is a mis configuration here:

the notification pop up when you navigate on [ Admin > System > Defaults ]
#Notification
Error: Unable to retrieve volume limit information.
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if you filter logs for cnider or error this one brings up which delight two point!

1- Authentication target            => localhost

2- Authentication API version   => v3

I'm sure that the localhost is wrong and should be the float address or at lease controller management interface address

as bellow nobody listen on localhost
[root@overcloud-controller-0 ~]# netstat -npltu | grep 5000
tcp        0      0 10.20.30.28:5000        0.0.0.0:*               LISTEN      2340/python2       
tcp        0      0 10.20.30.26:5000        0.0.0.0:*               LISTEN      1872/haproxy     

#ControllerLog
Oct 18 04:22:25 overcloud-controller-0.localdomain cinder-api[2374]: 2015-10-18 04:22:25.912 5406 ERROR cinder.api.middleware.fault [req-3512a941-266d-49f0-b580-4c4ab93ca4e9 42e375bb99ac4107803ea2dc8a254f8d 638b58b4ff54462195f34adf6cec427c - - -] Caught error: Authorization failed: Unable to establish connection to http://localhost:5000/v3/auth/tokens
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But I'm still looking to find how can I force [ cinder.api.middleware ] authentication configuration for example to update target ip address, be replace with localhost