By John StatonJohn.Staton@StarNewsOnline.comPublished: Tuesday, April 6, 2010 at 9:26 a.m.Last Modified: Tuesday, April 6, 2010 at 9:26 a.m. Maybe it's a product of being from the working-class city of Buffalo, N.Y., but there's not much pretension surrounding Johnny Rzeznik. While talking with him over the phone, the lead singer of power pop band The Goo Goo Dolls – who, with Collective Soul, will play a concert Thursday for the N.C. Azalea Festival – comes off as friendly and open, with a ready, often self-deprecating sense of humor and a reflective streak.Rzeznik formed The Goo Goo Dolls wi