TOKYO (Reuters) - Japan and the United States have agreed on a deal to allow Tokyo to join talks on a U.S.-led Asia-Pacific free trade pact that Prime Minister Shinzo Abe is making a keystone of his strategy to open Japan's economy and spur long-sought growth. "Japan and the U.S. agreed," Abe told reporters on Friday at the start of a meeting with cabinet ministers involved in trade matters. He added that he wanted Tokyo to join talks as soon as possible. ...