As far as Blake Snell is concerned, the training wheels might be just about off. The Padres bullpen, however, could use a few more safeguards. Tyrone Taylor’s three-run homer off Craig Stammen spoiled what began as a strong second start off the injured list for Snell, a back-breaking blow in a 4-1 loss to the Brewers to snap the Padres’ five-game winning streak on Tuesday night at Petco Park. Snell had gone toe-to-toe with reigning NL Cy Young winner Corbin Burnes for five innings before walking Andrew McCutchen to start the sixth inning. Christian Yelich’s one-out single to left ultimately ch…