changes storing location of message processors from DefaultModuleLoaderTask to DefaultModuleLoader

I took a second look into the code and changed it as discussed. Was not that difficult.
Besides this I realized that one testclass was not registered at the test suite... But these tests conflict a bit with the loaderContext that exists in the code and this I did not want to change...

- add missing tests for DefaultModuleLoaderTask
- two tests are commented out because of conflicts with the existing LoaderContext