EXECS ON THE MOVE: Lunch meats processorLand O'Frost , Lansing, Ill., said it promotedDavid Van Eekerento president. The company also promoted Chuck Niementowskito chief operating officer . . . Paperboard packaging supplerRock-Tenn, Norcross, Ga., said 34-year veteranDavid Dreibelbis, executive vice president and general manager for the company paperboard division, has retired due to health reasons. In conjunction, Rock-Tenn announced the following appointments:Mike Kiepura was named executive vice president, responsible for consumer packaging folding cartons;Dick Steedwas named executive vice president, responsible for a joint venture with Sonoco Products and other areas;Jim Porterwas named executive vice president, responsible for containerboard and corrugated packaging; andSteve Voorhees, executive vice president and chief financial officer, also was named chief administrative officer.