Code review comment for lp:~stub/launchpad/replication

Fix Bug #461800

new-slave.py is a script used on production to build a new slave database. It automates a non-trivial process. This process became even less trivial when we moved the authdb replication set master to a seperate database than the lpmain replication set master. One of the first steps this script needs to do is duplicate the schema. Unfortunately, with the 1.2 series of Slony-I, backups from slaves replication sets are incomplete (missing triggers etc.). So now we need to build the schema using two databases rather than the single database used previously (the master for both replication sets).