Finally, deal with image provenance and image deletion; need to deal with
all versions of an image when doing a delete, and since we never actually delete, we have to move the ndz/sig files out of the way (unless we have used the purge option, which is ignored for emulab-ops images anyway). To facilitate moving the images out of the way, mkdir a new home for all of the files, with the name $imagename:$imageid. We change the path in the DB as we move off each version of the image.
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