GLOBAL MARKETS-Stocks climb, bond yields dip after Portuguese bank rescue

(Adds U.S. market open, quote; changes dateline; previous LONDON) By Chuck Mikolajczak NEW YORK, Aug 4 (Reuters) - Bond prices rallied and European bank stocks rose on Monday after Portugal devised a plan to prevent the collapse of one of its biggest lenders. U.S. stocks edged up in early trade, with the S&P 500 coming off its worst week since 2012, as concerns over higher U.S. interest rates eased following Friday's U.S. employment report. Lisbon on Sunday announced a near 5 b