WESTFIELD, N.J. – John Rzeznik lives in a spacious, two-story home with manicured landscaping and a wrap-around porch supported by white columns. There’s a minivan in the driveway, and a Tesla, too. When the doorbell clangs, a chocolate lab named Roscoe greets visitors. Rzeznik is inside on a rainy late-summer day, brewing coffee that he’ll drink only after cooling it with water, lest he burn the vocal chords that got him here, and keep him here.Rzeznik’s daughter Liliana, who turns 2 in December, is in the kitchen. “Dad-DEEE!” she says, giggling as she toddles to her father. Lili, as Rzeznik