- test node support much less parameters, it will get them from
  the master
- testnode get list of test suite to install
- the instance folder structure has changed to support multiple
  test suites
- test node will delete useless test suites data if needed
- the master url should be a sub object (distributor) inside
  the task distibution tool
- the long run method has been splitted in many smaller methods
  (it is still possible to go futher