MOGADISHU, Somalia — The former al-Shabab foot soldiers assigned to a drab cement housing bloc are young – too young. One is only 9, yet they were enforcers of harsh edicts from Islamist militants who are preventing thousands of Somalis from escaping famine.The Associated Press obtained rare access to the former fighters at a government rehabilitation facility in Mogadishu last week, providing a unique view into the workings of the al-Qaida-linked group whose presence in much of Somalia is stymieing international efforts to provide emergency aid.