KISSIMMEE, Fla. – To Astros general manager Jeff Luhnow, the 2013 season already feels different than 2012. One day into spring training, Luhnow said everything from the club’s new manager and uniforms to a flood of new players competing for a spot on the Astros’ 25-man opening day roster created an excitement level at Osceola County Stadium that was nowhere to be found last year. “Just walking around (Monday), shaking hands and talking to some of the people, I think there’s a lot of excitement this year about the opportunity to make the club for everybody,” Luhnow said. He added: “There’s definitely an energy in there that I can sense. [...]