NEW DELHI — Bangladesh’s war-crimes tribunal on Tuesday sentenced Salahuddin Quader Chowdhury, an opposition lawmaker, to death for rape, mass murder and torture dating back to the country’s 1971 war of independence from Pakistan. Connect With Us on Twitter Follow @nytimesworld for international breaking news and headlines. Twitter List: Reporters and Editors It was the seventh death sentence to be handed down by the tribunal. Virtually every major turn in the legal process has sparked riots, either by…