The Unites States’ former consul general in Shanghai will become Washington’s top diplomat in Hong Kong and Macau, starting next month.Asia affairs expert Hanscom Smith will replace Kurt Tong as consul general from July, it was announced on Friday.Tong will leave Hong Kong to take up a position in the private sector, having served as the chief of mission for the Americans in the city since August 2016.When Smith was serving as the US consul general in Shanghai in May 2016, he married his same…