By Howard Schneider and Lindsay Dunsmuir WASHINGTON (Reuters) -U.S. Federal Reserve officials on Monday sloughed off rising volatility in global markets, from slumping U.S. stocks to currency turbulence abroad, and said their priority remained controlling domestic inflation. Asked at a Washington Post event whether he felt U.S. investors had taken an overly optimistic view of Fed policy until a recent sharp sell-off begin, Atlanta Fed president Raphael Bostic said that was beside the point. “I don’t know whether they’re too optimistic or not optimistic enough … The more important thing is th…