KOGELO, Kenya, Nov 7 (Reuters) - Within hours of Barack Obama's election victory, Kenya sent workers to bring electricity for the first time to his late father's rural village. Obama may find it hard to bring such fast, tangible benefits to a whole continent that greeted his White House triumph with euphoria and vast expectations. The appointment of a "son of Africa" to the most powerful position in the world has sent hopes for change soaring. But given the global economic meltdown, and myriad other foreign policy priorities -- not least Iraq, Afghanistan, Russia and Iran -- the Obama administration's...