Bug#696168: d-i: use trusted=yes in sources.list instead of --allow-unauthenticated

[Ansgar Burchardt <ansgar@debian.org>]

Package: debian-installer
Version: 20121114
Severity: wishlist

Since apt_0.8.16~exp3 one can disable secure apt for specific
repositories instead of having to use --allow-unauthenticated and
disable verification for all repositories.  Such entries look like

  deb [trusted=yes] file:///some/where

It would be nice if get-packages could use this for the localudeb
support instead of disabling secure apt even for remote repositories.

Ansgar