SEOUL (Reuters) - Hyundai Motor Group companies’ shareholders rejected on Friday Elliott Management’s demands for a massive special dividend and board seats, dealing a blow to the U.S. hedge fund’s campaign to shake up South Korea’s second-biggest family-run conglomerate. Although Hyundai fended off the threat from Elliott at the closely watched vote, it still faces a daunting challenge of winning shareholder support for a planned restructuring that should aid the handover of the group’s reins to heir apparent Euisun Chung.