IMGAPI-408: cleanup 'owner' handling when importing from a remote imgapi
IMGAPI-408: cleanup 'owner' handling when importing from a remote imgapi

The owner for the img deps (now in updates.jo) are already now
all-zeros.

joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode