Code review comment for lp:~mpontillo/maas/fix-map-interfaces-by-mac-failure-with-bond-driver-loaded

Looks good, defensive programming FTW. Can you confirm that this is indeed a critical bug? Tweak the preseed to load the bonding driver and make sure the deploy fails. If it fails (and this fixes the problem), let's file a critical bug, add a mention to the 1.8.0 changelog and backport this to 1.8.