CANBERRA (Reuters) - Australia could one day allow U.S. spy flights to operate from a remote Indian Ocean island, Defense Minister Stephen Smith confirmed on Wednesday, supporting the U.S. pivot to Asia but likely upsetting Australia's biggest trading partner, China. Smith said the possible use of Australia's remote Cocos Islands territory had been raised with the United States, but the proposal was not under active consideration and was not among current plans for Canberra to strengthen military ties with Washington. "We view Cocos as being potentially a long term strategic location. ...