LONDON — European stocks are expected to open in mixed territory on Monday, kicking off August trading on uncertain footing. The U.K.’s FTSE index is seen opening 8 points lower at 7,420, Germany’s DAX up 1 point at 13,478, France’s CAC 40 down 9 points at 6,442 and Italy’s FTSE MIB down 55 points at 22,343,…