Need a way to allow user to register config opts locally

[Guang Yee]

Per

https://review.openstack.org/#/c/108540/1/marconi/queues/transport/auth.py

_OPTS is now a private global variable. However, Marconi have the need to be able to register the opts in its local config. We need to expose a way to allow user to register the config opts locally.

[Morgan Fainberg (mdrnstm)]

Does this method: http://git.openstack.org/cgit/openstack/keystonemiddleware/tree/keystonemiddleware/opts.py#n29 (not private) solve the issue?

This is the method we use for the config generator and has an entry point already.

[Guang Yee (guang-yee)]

Yes, that'll work.