Opening up visibility of constants driver and class names as required (at least) by TUC-2355

git-svn-id: http://tungsten-replicator.googlecode.com/svn/trunk@2688 9f5e3340-5c9a-25cb-7c1c-c133a2e9e928
CONT-65 - supress stack traces when host is down

git-svn-id: http://tungsten-replicator.googlecode.com/svn/trunk@2689 9f5e3340-5c9a-25cb-7c1c-c133a2e9e928