Ignore purge flag (delete image file) when a system image, until we figure out what deletion with deltas means. Still a problem for users, but at the moment we have not enabled provenance for mere users.
Ignore purge flag (delete image file) when a system image, until
we figure out what deletion with deltas means. Still a problem for
users, but at the moment we have not enabled provenance for mere
users.

Aside: Need to change purge so that we delete all image files
(file for each version). Forgot to do that.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome