Mountain Goats perform at Front Porch Music Festival at Wente Vineyards in Livermore, Calif., on Sept. 1, 2012. Photos: Eric O’Donnell. Livermore’s Wente Vineyards, venerable for hosting big-name artists like John Fogerty, Sheryl Crow and Dianna Krall, went indie Saturday with a double-bill of The Mountain Goats and The…