John Hopewell Chief International Correspondent“Remember, you have been trained for this,” says a veteran cop to the rookies sitting in the back of a van as they approach a post-soccer match brawl at a local park.But in “Huss” nothing in her police academy lessons prepares Katarina Huss for her months as a trainee on the mean streets of Sweden’s Göteborg: Abduction, battery, corruption, betrayal, manslaughter and attempted murder.