Two main changes:
* 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.