Shortly after his victorious sit-in with Teddy Swims on Coachella’s main stage, David Lee Roth strutted into the media tent. He was still in his stage wear — leather vest, form-fitting silver-and-black-pants, wraparound shades, and the massive smile that’s been his trademark since his early days fronting Van Halen — and still on fire, buzzing from having just played “Jump” for the Coachella crowd. In a rapid-fire back-and-forth with the 71-year-old, who’s currently in the midst of his own solo