Bug 617017: Deploy db cleanup on bm81 to run weekly. r=dustin
Bug 930731: more Ubuntu-server tweaks; r=dividehex

* get pidfile right for nagios
* get the daemon directory right for postfix
* don't run ganglia
* don't let Ubuntu helpfully start a nagios daemon
Bug 914623: pin nodejs version; r=rail
Bug 914623: handle multiple cows; r=rail
Bug 931875: upgrade nodejs to 0.10.21; r=rail