Comment 26 for bug 1460492

Actually - I shouldn't have closed this. Keystone doesn't restrict credential type to only `ec2` and `cert`, which is what I was thinking it did. If that were the case we would be able to list credentials by all supported types. But since that isn't the case we should still keep this open for openstackclient. An example would be creating a credential of type `totp` to use for multifactor authentication. Example of creating credentials with `totp` types can be found in our documentation [0].

[0] http://docs.openstack.org/developer/keystone/auth-totp.html