By Nuzulack Dausen DAR ES SALAAM (Reuters) -Tanzanian opposition leader and former presidential candidate Tundu Lissu returned home from years of exile in Belgium to a cheering crowd on Wednesday, after the government lifted a ban on political rallies. A former lawmaker and a fierce critic of the government, Lissu initially left the country to seek treatment abroad after he was shot 16 times, mostly in his lower abdomen, in an attack by unknown gunmen in the administrative capital Dodoma in 2017. President Samia Suluhu Hassan lifted a ban on political rallies this month, more than six years af…