Comment 6 for bug 1409218

Ticket 1418837 complains that the arguments to 'credential set' claim to be optional but in reality are required. The spec https://github.com/openstack/keystone-specs/blob/master/api/v3/identity-api-v3.rst#credentials-v3credentials says they are required too.

I have a change proposed https://review.openstack.org/#/c/226922/ enforcing that user, type, and data (aka blob) are all required. Should ec2 work differently?