Comment 14 for bug 1592612

@michael, I like the idea, but it would be a change of behavior. This could be config option. barbican_user: (admin or passthrough). When "admin" is set then barbican_admin_user and barbican_admin_password is configured (current behavior). When "passthrough" is set, then the user's token from "neuton lbaas-listener-create" is passed through. In either case, the user will need to have permissions to the secrets. This can be done via Barbican ACL or via the user having role and project matching the secret.