* Add mailman to the install process. This includes the package
  install, all the setup needed in ops-install, and the little patches
  we apply locally.

  Note: Only under 6.0: no point in going backwards since its a pain
  in the ass to build these packages for the 4.10 image.

* Push more of the package install back down into the ops/boss install
  scripts. This improves testing within those scripts, and avoids
  duplication. There are some changes in rc.mkelab that will temp
  mount the package dir on /packages for the benefit of the scripts.