COPENHAGEN, Denmark—A 22-year-old Afghan asylum-seeker was convicted Wednesday of attempted murder and sentenced to life imprisonment for a knife attack that injured seven people in a southern Swedish town earlier this year. Tamin Sultani was shot by police and arrested after an 18-minute rampage on March 3. Investigators who dismissed terrorism as a motive charged him with seven cases of attempted murder. The Eksjo District Court said Sultani will be deported after serving his time. He has said he wanted to go back to Afghanistan. The life sentence, which doesn’t have a fixed time, is the most severe punishment in Sweden. Sultani attacked seven men with a 22-centimeter (8.7-inch) blade in the small town of Vetlanda, about 190 kilometers (118 miles) southeast of Goteborg, Sweden’s second-largest city. Three of the victims survived life-threatening injuries, two were seriously injured, two others were moderately injured and one individual was slightly hurt. Police …