Add creator_urn to images table so we can track actual creator
when created via the ProtoGeni interface; we run everything as GeniUser and so lose that info. We want to know this for history information and so we can manage permissions on image deletion effectively. Also add updater, updater_idx, and updater_urn to track last change to the image. CAVEAT: For system images, we do not actually overwrite the image, but store it out in /proj/$pid/images and then sometime later maybe we copy it back to boss. This wrecks the tracking info quite effectively since the image may never be copied back. Needs more thought.
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