OAKLAND, Calif. — Six days ago, first-year manager Bo Porter said Astros righthander Bud Norris was growing up before the eyes of the baseball world. Norris, 28, had just thrown seven scoreless, winning innings last Friday against the big-money Los Angeles Angels. The Astros had improved to 3-1 on their nine-game, 10-day American League West road trip. And with the team’s No. 1 pitcher adding an improving changeup to his strong fastball-slider combination, a club whose active payroll is $20 million and that had decided to hold on to its top hurler instead of pulling off another trade for prospects had gained a valuable asset with increasing value. Norris is [...]