Expose region name to UI

Enable support for custom region name. This name is use to register the
keystone endpoint. It doesn't support multiple endpoints for different
regions.

related to: https://bugzilla.novell.com/show_bug.cgi?id=896481
@dirkmueller Fixed in https://github.com/toabctl/barclamp-keystone/commit/1e5cd38dcaf24cc30034b83e8cdd72306acb3f4b