Comment 0 for bug 1745905

For some project, such as Cinder, the endpoint is project specified, the format is like:
http://ip/volume/v3/{project_id}/volumes

There are two problem:
1. For this kind of endpoint, system-scoped token doesn't work because that there is no project_id in the token.

2. When issue a system-scoped token, the Cinder's endpoint in the token catalog is empty. It means the Cinder service will not be discoverable when use system-scoped token.