Ian Wienand a0f747932d Install systemd earlier for Stretch

Debian Stretch released as stable recently, and the init system is
less tightly specified in the base dependencies (for some info, see
[1]).  It seems, probably unintentionally, that in the previous
release systemd-sysv was brought in by debootstrap, but that is no
longer happening.

Add systemd as an early dependency of debian-minimal.

Remove the package-installs.yaml as that happens too late (other
things need to know the init system to write out service files, etc
and probe for systemd utils before package-installs).  As mentioned, I
do not believe the "only install systemd on testing" idea was actually
working here, because it was being brought in during the initial
debootstrap.

Update some documentation to explain what's going on

[1] https://lists.debian.org/debian-boot/2015/05/msg00156.html

Change-Id: Id67c0cf08728407d234976f9807d3bd71d12f758

2017-06-19 13:27:33 +10:00

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debian-upstart

By default Debian will use sysvinit for booting. If you want to experiment with Upstart, or have need of it due to a need for upstart jobs, this element will build the image with upstart as the init system.

Note that this works with the debian element, not the debian-minimal element.

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debian-upstart

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