When triggering an update at another cluster, send along the urn of the
user doing the image snapshot. At the image origin cluster, use this URN to set the updater urn for the new image version, and if that urn is fot a real local user, also set the updater,updater_idx accordingly. Lastly, the image import *must* be done in the context of a user in the project of the image, so fall back to using the image creator.
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