* 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.