With mere days to go before the opening date of the band’s co-headlining tour with Train (Friday at the White River Amphitheatre east of Tacoma), Goo Goo Dolls lead singer/guitarist John Rzeznik and bassist Robby Takac were in Seattle putting the finishing touches on the stage show and squeezing in a few last-minute rehearsals.“Making sure everything is solidifying,” Rzeznik said in a phone interview. “We want to make sure it’s right.”The co-headlining tour brings the Goo Goo Dolls and Train to Northern Quest Resort and Casino on Sunday and takes both bands, plus Chewelah’s Allen Stone, who wo