PDI-3957: Palo - Fixed the read only dimension grouping collection to return the iterator of the internally managed list.
PDI-3957: Palo - Fixed the read only dimension grouping collection to return the iterator of the internally managed list.

git-svn-id: 51b39fcfd0d3a6ea7caa15377cad4af13b9d2664@13174 5fb7f6ec-07c1-534a-b4ca-9155e429e800

juanmjacobs/kettle,juanmjacobs/kettle,cwarden/kettle,cwarden/kettle,cwarden/kettle,juanmjacobs/kettle