RENO — Police Sgt. John Gutierrez was going to move his car before getting a parking ticket when he encountered someone he thought was a routine car burglar on a dark street in San Francisco about a block from his campus police headquarters. Instead, he testified Monday, he found the subject of a massive manhunt that was launched after a high-ranking member of the Hells Angels was killed in a gun battle with a rival gang at a hotel-casino in Sparks. Sgt. Gutierrez said that Ernesto Gonzalez, 53, president of the Vagos chapter in Nicaragua, eventually told him he was …