Feb 5 (Reuters) - China's double Olympic swimming gold medallist Sun Yang has been suspended from all commercial activities for breaching a "series of team rules", state news agency Xinhua reported on Tuesday. The Zhejiang College of Sports, to which Sun is affiliated, has also withheld his monthly allowance after the 21-year-old, who won two freestyle gold at the London Olympics last year, missed training for over 40 days, the report said.