Add debian-upstart for experimenting with upstart

Upstart support in Debian is somewhat experimental, but having it would
be especially useful for TripleO which already generates upstart scripts
which will work fairly well on Debian based systems.

Change-Id: I267da5ae7bc4a484fac152a14963d96ca2ad2693

elements/debian-upstart/README.md

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+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.

elements/debian-upstart/element-deps

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+debian

elements/debian-upstart/root.d/05-debian-upstart

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+#!/bin/bash
+set -eux
+echo upstart >> ${TARGET_ROOT}/.extra-packages
+echo debian-upstart >> ${TARGET_ROOT}/.distro-name

elements/debian-upstart/root.d/20-debian-fix-upstart-jobs

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+#!/bin/bash
+set -eux
+# Working around bug in Debian cloud-init packages with upstart
+# where startpar will wait forever for these because they are tasks
+# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735204
+for sysv_script in cloud-init cloud-init-local cloud-config cloud-final ; do
+    sudo rm -f ${TARGET_ROOT}/etc/rc2.d/??${sysv_script} ${TARGET_ROOT}/etc/init.d/${sysv_script}
+done
+# And working around upstart job bug in Debian where cloud-config will never run
+# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735207
+sudo sed -i -e 's/start on .*/start on started rc RUNLEVEL=[2345]/' ${TARGET_ROOT}/etc/init/cloud-config.conf

elements/debian-upstart/root.d/99-cleanup-debian-upstart

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+#!/bin/bash
+set -eux
+sudo rm -f ${TARGET_ROOT}/.distro-name ${TARGET_ROOT}/.extra-packages