CONT-48, TUC-1592, TUC-2313, TUC-437: drizzle is now the real default - I missed a spot where default was set to mysql :(

git-svn-id: http://tungsten-replicator.googlecode.com/svn/trunk@2681 9f5e3340-5c9a-25cb-7c1c-c133a2e9e928