By Annika Breidthardt BERLIN (Reuters) - Two years ago, German Finance Minister Wolfgang Schaeuble was on the point of giving up his role as iron fist in the euro zone debt crisis, but the 70-year-old champion of closer European integration now seems likely to remain on Europe's center stage. Chancellor Angela Merkel, who made her independent-minded and famously irritable former rival finance minister in 2009, is expected to reappoint him if, as widely forecast, she wins a third term in the September 22 parliamentary poll. ...