SAN DIEGO (AP) – Edinson Volquez threw seven strong innings and Carlos Quentin hit his first home run of the season, helping the San Diego Padres snap Milwaukee’s nine-game winning streak with a 2-1 victory over the Brewers on Wednesday night.   Volquez (1-3) allowed just five singles, struck out three and did not walk a batter, lowering his ERA from 8.84 to 6.39 as San Diego ended a five-game skid. It marked only the fourth time in 127 starts that Volquez did not walk a batter.  Estrada (2-1) pitched 6 1-3 innings, allowing two runs, one earned, with two walks and three strikeouts.  Huston Street worked the ninth for his third save in as many opportunities.