“debian” element now source the ${TARGET_ROOT}/.extra_settings file. We
can use this file to adjust its behavior and specifiy what init system
should be used.
Change-Id: Id57ce879341184a57851d2578cf70978f409a48e
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.