Disabling deb-src by default

[Martin Pitt]

Usama Akkad [2016-01-28 10:38 +0200]:
> Source packages are enabled by default.

We don't enable them by default on cloud images, so I guess it can't
be a legal requirement to have them. ubuntu-dev-tools has
pull-lp-source which works without local apt sources, but we don't
install that by default -- and we shouldn't as-is as it has a horribly
heavy dependency chain.

But maybe we can separate out pull-lp-source so that it's suitable for
shipping by default?

Martin
-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)