- add a fixit script to fill the gap between the current situation and

  the desired situation. Ideally, nodes' configuration files and GPG
  keys would be initially installed by the Boot Manager, then pushed to
  the reference images and system slices by vserver-reference
  init/cron. However, we don't want to re-install nodes, and we don't
  want to upgrade vserver-reference, so between PlanetLabConf,
  NodeUpdate, and this script, we should be able to get to a point where
  we can enable GPG checking of RPMs.