code: private ItemData initACL(NodeData parent, NodeData node) throws RepositoryException
     {
        return initACL(parent, node, null);
     }
docs: Init ACL of the node.
  @param parent
  - a parent, can be null (get item by id)
  @param node
  - an item data
  @return - an item data with ACL was initialized
  @throws RepositoryException