MOGADISHU, Somalia — There are few success stories here in this tortured country on the eastern coast of Africa. For nearly two decades, this drought-ravaged land and the long-suffering Somali people have been “off the radar” for most Americans. It might still be so if it were not for radical Islamist Somali terrorists — al-Shabab — and their financiers, the seagoing pirates who seize merchant vessels plying the Indian Ocean and the Gulf of Aden. All of that is about to change.