SAN FRANCISCO — The Giants kept referring to Monday’s roster shakeup as a “fresh start.” But it didn’t take them long to get back to their normal ways. They managed just three hits Wednesday and didn’t draw a walk for the second consecutive game, losing 5-1 to the San Diego Padres and dropping a third consecutive series. They have lost eight of their last nine and are nine games under .500.Adrian Houser had his best start as a Giant and needed just 73 pitches to get through six one-run innings. His first pitch of the seventh was a slow grounder to third that Matt Chapman booted, and manager Tony Vitello immediately came out and called for his bullpen. That started an interesting series of moves for two first-time managers. Vitello went with Keaton Winn, who immediately walked a batter before recording two outs. With the go-ahead run on third, Vitello turned to Matt Gage, which in theory gave the Padres plenty of time to get a pinch-hitter available so rookie left-handed-hitter Sung-Mun Song wouldn’t face a lefty.Song initially walked to the plate and then went back to the dugout so late that the Padres were called for a...