
When the per-node external_http_url feature was introduced by
c197a2d8b2
, it only applied to a config
floppy. This fix ensures that it is also used for the boot ISO, both
when it is generated locally (by _prepare_iso_image()) or just cached
locally (by prepare_remote_image()).
Change-Id: Ic241da6845b4d97fd29888e28cc1d9ee34e182c1
Closes-Bug: #2044314