The Australian wine giant BRL Hardy suggested today that it may invest in a large German distribution company as a means to drive sales in that country.   In an interview on Dow Jones newwires, BRL Hardy Managing Director Stephen Millar said the company has a shortlist of potential candidates, however, it will probably be a couple of years before a deal is secured.  He said a possible scenario was a 15% stake in a distributor with "real clout".