The only types of routers in this file should be ComposingRouters.
The routers for the backends should be in the backend-specific router modules. For example, the ComposableRouter for identity belongs in:
keystone.identity.routers
Bases: keystone.common.wsgi.ComposableRouter
Bases: keystone.common.wsgi.ComposableRouter
Bases: keystone.common.wsgi.ComposableRouter
Bases: keystone.common.wsgi.ComposableRouter