Internal Keystone URL cannot use admin port

Fixes: https://www.pivotaltracker.com/story/show/44679259

The keystone endpoint internalURL must not have the
admin port. It must use the regular service port.
This misconfiguration caused the following bugs:

https://bugs.launchpad.net/horizon/+bug/1122758
https://bugs.launchpad.net/horizon/+bug/1123184