Comment 9 for bug 1643990

$ release=xenial
$ lxc launch ubuntu-daily:$release $name

$ lxc exec $name -- dpkg-query --show cloud-init
cloud-init 0.7.8-49-g9e904bb-0ubuntu1~16.04.4

$ lxc file pull $name/etc/cloud/build.info -
build_name: server
serial: 20170207

$ lxc exec $name -- head -n 1 /var/log/cloud-init.log
Feb 9 02:26:04 x1 [CLOUDINIT] util.py[DEBUG]: Cloud-init v. 0.7.8 running 'modules:config' at Thu, 09 Feb 2017 02:26:03 +0000. Up 9.0 seconds.

## enable proposed, update
$ m=http://archive.ubuntu.com/ubuntu;
$ echo "deb $m $release-proposed main" | lxc file push - $name/etc/apt/sources.list.d/proposed.list
$ lxc exec $name -- sh -c 'apt-get update -q && apt-get install cloud-init' </dev/null
$ lxc exec $name -- dpkg-query --show cloud-init
cloud-init 0.7.9-0ubuntu1~16.04.2

# clean up to make it look like first boot.
$ lxc exec $name -- sh -c 'cd /var/lib/cloud; for d in *; do [ "$d" = "seed" ] || rm -vRf "$d"; done'
$ lxc exec $name -- sh -c 'rm -f /var/log/cloud*'
$ lxc restart $name

$ lxc exec $name -- grep WARN /var/log/cloud-init.log || echo no warn
no warn
$ lxc exec $name -- head -n 1 /var/log/cloud-init.log
2017-02-09 02:29:15,960 - util.py[DEBUG]: Cloud-init v. 0.7.9 running 'init-local' at Thu, 09 Feb 2017 02:29:15 +0000. Up 1.0 seconds.