By Dave Sherwood HAVANA (Reuters) – Cubans poured onto the streets in celebration of International Worker’s Day on Sunday, the first such parade since the onset of the coronavirus pandemic, touting fluttering flags, posters of former leader Fidel Castro and chanting “Cuba Lives and Works.” Cuban President Miguel Diaz-Canel and former revolutionary leader Raul Castro, wearing a white mask and dressed in hallmark military fatigues, oversaw the rallies from a stage overlooking Havana’s “Plaza de la Revolucion.” The marches, held each year across the Communist-run country prior to the pandemic, ar…