SYDNEY (Reuters) – A 35-year-old British diving instructor has been identified as the person killed in a shark attack off a Sydney beach, Australian media reported on Friday, as officials reopened several beaches after the city’s first fatal attack in 60 years. Simon Nellist, who moved to Australia about six years ago, was killed on Wednesday off Little Bay beach, about 20 km (12 miles) south of Australia’s largest city while training for a weekend charity swim event, reports said, citing his friends. Nellist, a former UK Royal Air Force serviceman, was a member of the city’s scuba diving club…