ABU DHABI, Dec 9 (Reuters) - Markets roiled by geopolitical tensions and diverging interest rates present money-making opportunities for the coming year, the heads of hedge funds Man ​Group and Brevan Howard and the Abu Dhabi Investment Council's chief investor said on ‌Tuesday. U.S. President Donald Trump's return to the White House and an erratic trade policy have whipsawed world markets this ‌year, just as investors try to assess the direction of major central banks such as the U.S. Federal Reserve and ...