Comment 2 for bug 1889079

Did you see Cory's comment about this on Mattermost yesterday?

> It seems that region is also required[1] and is missing from the docs.

In other words, can you use the required fields documented in the credentials config description, but add "region" as well? The full list should be:

auth-url
username
password
project-name
user-domain-name
project-domain-name
region

[1]: https://github.com/juju-solutions/charm-openstack-integrator/blob/master/lib/charms/layer/openstack.py#L48