* Cabrera tests positive for testosterone * Will miss early playoff run should Giants qualify (Updates with Giants loss) Aug 15 - The San Francisco Giants' postseasonambitions suffered a jolt on Wednesday when All-Star outfielderMelky Cabrera was suspended for 50 games for failing a dopingtest. The 28-year-old from the Dominican Republic, the mostvaluable player in this year's All-Star game, had testedpositive for testosterone and admitted to using a substancebanned by Major League Baseball's drug prevention program. ...