ATLANTA – Reynaldo López’s night lasted only two innings, but it advanced the Atlanta Braves ’ newest formula for surviving a battered rotation while putting up wins. As players like Spencer Strider begin to return from injuries and young arms like JR Ritchie continue to emerge, mobility has become a priority.  Pairing the starter’s mechanical struggles with this new reality pushed López to the bullpen. Wednesday night provided the first glimpse of him in that new role, and he was outstanding for the Braves. López struck out a pair of Tigers over two scoreless innings, holding the deficit at one run in what turned out to be a walk-off win.  This is precisely what Weisss had in mind when he made this move.  “He’s in a good place,” Weiss said. “He’s very upbeat, and he’s a pro. We talked about everything the other day. I brought him in and just made sure there’s clarity there.…