By Robert Koehler The credits, right there on screen, insist that Quai d’Orsay is “un film de Bertrand Tavernier,” but I don’t believe it. Maybe some imposter named “Bertrand Tavernier,” appropriating the name of a director who, to put it mildly, is hardly associated with satirical farce. Adapting former government speechwriter Abel Lanzac’s autobiographical graphic…