By Siyabonga Sishi and Rogan Ward ETHEKWINI, South Africa (Reuters) – Rescuers searched for dozens of people still missing in South Africa’s KwaZulu-Natal (KZN) province on Sunday after heavy rains in recent days triggered floods and mudslides that have killed more than 440 people. The floods have left thousands homeless, knocked out power and water services and disrupted operations at one of Africa’s busiest ports, Durban. A provincial economic official estimated the overall infrastructure damage at more than 10 billion rand ($684.6 million). The province’s premier, Sihle Zikalala, said the d…