The current set of integrations of the dbtasks (ie db2bak, db2index etc) are really annoying. they take a variable set of arguments, they sometimes don't work, they shell to perl, and they also force the server to start after the task is run.

We should move these to a proper dbtasks module, remove the current ones, and simplify this. It will break some tests, but they wil be easy to locate and restore to operation.