TrigInDetValidation : fixes for "ml" art tests
Change name test_trigID_fsjet_ml++_pu40.py to test_trigID_fsjet_ml2_pu40.py : art didn't like the "++"
Remove TIDAml_extensions.py
from get_files in TrigInDetRdictStep : it wasn't needed for the rdict step.
Now the jobO path is corrected in the test it should be read from the build area.