Comment 7 for bug 1576692

The bit that I have doubts about in https://git.launchpad.net/~smoser/cloud-init/commit/?h=bug/1576692&id=6a249689a179f is why "runcmd" still runs in cloud_config_modules -- it's arbitrary code which might (and often does) run package installs, so it should really live in cloud_final_modules as well?