Comment 4 for bug 1306178

I raised this issue in one of my upgrade tests (Filed bug 1297942 for it). The discussion and rationale to invalidate the bug is here: https://lists.launchpad.net/private-canonical-maas/msg01052.html. Basically users shouldn't update the DEFAULT_MAAS_URL directly, rather use dpkg-reconfigure or set the value with a seed file and debconf-set-selections.