In a typical company, the passing of the reins from one generation to the next is cause for a retirement party, a gold watch, a few pithy speeches. But Hennessy isn’t just any company, and Master Cognac Blender Yann Fillioux isn’t just any employee. For more than 200 years, the Fillioux family and the Hennessy family have worked together to make Hennessy the best-selling cognac in the world…