All of the aptitude code gets moved into a new class, which gets put into its own phase of the Puppet process.

Hold off on modifying the main sources file until
we’ve created all our other sources files.

For Stanford repositories, we’ve got a list of Ubuntu dsitros that map to Debian distros.  That list is updated.

Only start daemontools in ubuntu 14.10 and below.  Also make sure daemontools is brough in before we need it.

Debian jessie introduced pam-auth-update, which packages call when they have
bits of common PAM configuration.