TUC-1592, TUC-437: setting drizzle as the default driver, everywhere

git-svn-id: http://tungsten-replicator.googlecode.com/svn/trunk@2642 9f5e3340-5c9a-25cb-7c1c-c133a2e9e928
Add mechanisms to ensure the temporary directory is available on each host during installation. It's possible that it is being removed and causing issues.


git-svn-id: http://tungsten-replicator.googlecode.com/svn/trunk@2643 9f5e3340-5c9a-25cb-7c1c-c133a2e9e928