Comment 1 for bug 1461752

As per discussion on IRC -- this is working as intended, if it is rejecting containers when passed in simply as a UUID. The user must pass in a full container_ref. We might want to try to catch/validate even sooner in the API layer that the value for container_ref must be a full URI, not just a UUID. This feature does not seem to be well documented though, as I can't find anything describing its use, and the spec document for it is old and inaccurate (which appears to be what caused the confusion). We really need proper documentation, since at this moment it looks like the only "docs" are a few scattered wiki pages and blog posts with unclear examples.