DENVER (AP) — Wyatt Johnston scored twice on the eve of his 21st birthday as the Dallas Stars pushed Colorado to the brink of elimination Monday night with a 5-1 win in Game 4 that came hours after Avalanche standout Valeri Nichushkin was suspended for at least six months. Johnston had short-handed and power-play goals for the Stars, who grabbed a 3-1 lead in the second-round, best-of-seven series. Dallas can close it out at home in Game 5 on Wednesday. “He (Johnston) came out possessed tonight,