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How do you configure/use keystonemiddleware for a specific identity endpoint among several?

In an OPNFV multi region prototype I have keystone endpoints per region. I would like 
keystonemiddleware (in context of glance-api) to use the local keystone for performing user token 
validation. Instead keystonemiddleware seems to use the first listed keystone endpoint in the 
service catalog (which could be wrong/non-optimal in most regions).

I found this closed, related bug: https://bugs.launchpad.net/python-keystoneclient/+bug/1147530

Thanks,
Hans