There are a completely new set of modules that do all of the things like
keystone v3 and auth_plugins and the like correctly. Structurally
upgrading these would have been massively disruptive and there is no
real good way to do so without breaking people.
These modules should be kept around for several releases - they still
work for people - and they should get bug fixes. But they should not
take new features. New features should go to the os_ modules.
