Last year, Foo Fighters filed lawsuits, faked their own breakup, and rocked out to GN’R, but Dave Grohl and the boys haven’t actually played a live show since 2015. They recently announced a few European festival dates, and now, they’ve shared their first U.S. gig in 19 months, co-headlining the BottleRock Festival in California’s Napa Valley with Tom…