Comment 9 for bug 1750074

I don't think this fix is adequate:
https://review.openstack.org/#/c/545486/

The code in cinder/service.py fails to account for a bunch of other options, such as

transport_url=qpid://...
sql_connection=mysql+pymysql://...

This needs to be leveraging the secret flag for options, like this code does:
https://git.openstack.org/cgit/openstack/oslo.config/tree/oslo_config/cfg.py?h=5.2.0#n2865