I think I have finally decided that I want *collectd* to run in a
container on FCOS machines. It's much easier and quicker to deploy and
configure that way. The only drawback is how filesystems are monitored,
but I think I am okay with `ReportByDevice` now. In fact, I might even
like it better, since container hosts have *tons* of redundant mounts
that add noise to the disk usage charts.
The `common.yaml` Butane configuration file merges in all the other
various Butane configuration files that we want to share amonst all
CoreOS machines. These include the authorized SSH keys list, collectd
deployment, SSH host certificate configuration, etc.