Sunni fighters gathering this month in Shirqat, Iraq.Credit...Reuters WASHINGTON — Iraq’s prime minister, Haider al-Abadi, has said that by the end of the year Mosul, Iraq’s second largest city, will be liberated from the Islamic State’s control. As of this month, Mr. Abadi, a Shiite, has had two years to rebuild the Iraqi Army with the support of an international coalition. Unfortunately, the ins