LONDON, Aug 11 (Reuters) – Angolan crude grades were largely sold out on Monday ending several months of overhang after prices dropped low enough to prompt Asian refiners to buy despite a light sweet oil glut in their region. Angola’s October loading programme was expected to emerge by the end of the week or early next week. Some differentials for Angolan grades recently plummeted to their lowest since 2008. “I think prices have hit a bottom and will probably stagnate around here for a