VIERA, Fla. – Bo Porter couldn’t trump Davey Johnson’s Washington Nationals. But the Astros’ first-year manager was the main attraction Tuesday morning at Space Coast Stadium. Facing his former club for the first time since being hired by the Astros on Sept. 27, 2012, Porter addressed a larger-than-normal media contingent curious about his new life leading a non-playoff contender. “He’s fully prepared to be an outstanding manager in the big leagues. He’s very fundamentally sound in all aspects of the game and he’s a great judge of talent,” said Johnson, who led the 2012 Nationals to the best record in baseball before falling to St. Louis in a National League [...]