Hundreds of people returning home to parts of Asia, the United States and Britain from the mainland Chinese province of Hubei and the coronavirus-stricken Diamond Princess cruise ship are facing an additional two weeks in government quarantine.Health authorities want to isolate them in case they end up testing positive for Covid-19, the illness caused by the coronavirus, which has sickened over 80,000 people and claimed more than 2,700 lives, mostly in mainland China.The conditions of their…