KISSIMMEE, Fla. — Friday was the quietest and most uneventful day of Astros spring training since manager Bo Porter began his season-long overhaul. Except for four minutes. Six weeks after being suspended from baseball because of his second failed drug test, Astros first base prospect Jonathan Singleton addressed the media at Osceola County Stadium. Singleton spoke quietly and often failed to make eye contact, employing brief answers and often resorting to clichés. But he responded to every question that was fired his way, insisting he’ll show his “true colors” moving forward. Singleton is 21 and has yet to play above the Double-A level. But in another sign of the depth [...]