Refactor ganeti-0mqd to run as a UNIX daemon:
  * Log under /var/log/synnefo by default
  * Maintain PID file under /var/run/synnefo
  * Handle signals gracefully

Refactor ganeti-0mqd to be a 0mq message broker:
    * A separate thread handles receiving notifications from a PULL
      socket and publishing them to a PUB endpoint.
    * Notifications come from running inotify() on the Ganeti job queue
    * ...or from synnefo hooks running inside Ganeti (e.g., notifications
      for VM network updates)

Make all settings user-configurable, through settings.py and
command-line arguments.