The case does not represent the request.  The RFE above is related to the management of the imageStream and layers in the internal docker registry on the OpenShift master.  In reading the case notes, the customer is asking about removing images from the OpenShift nodes out in /var/lib/docker/images.  For that, we have a garbage collector that kubernetes runs and removes the unused images.  It is configurable as to its cadence.  Is that all you need?