The apt-sources element did not work with debian-minimal, because
the later one overwrote the /etc/apt/sources.list file created by
the apt-sources element.
Two changes were made:
o the debian-minimal uses now files inside the /etc/apt/sources.list.d
directory. Therefore there is no possibilty for clashes between those
two elements any more.
o instead of only adding backports, also the updates and the security
repository is added by default which gives perfect initial
configuration for a stable system.
If you want to use local mirrors with other naming schemas or an
unstable tree, there is the possibility to fully specify the
repositories.
Change-Id: I69dbaa34be3db3d667e6bd8450ef4ce04a751c70
Signed-off-by: Andreas Florath <andreas@florath.net>