Remove region_name from service catalog
Remove region_name from service catalog

This would allow you to save a region_name on the catalog so that all
your responses were relative to that region_name. This was deprecated,
if you want to search by region name you have to provide it.

Change-Id: Idd7a62a6ce44c3697f62939038d0322482f1e527

citrix-openstack-build/keystoneauth,sileht/keystoneauth,jamielennox/keystoneauth