By Siyabonga Sishi UMBUMBULU, South Africa (Reuters) – Thousands of South African soldiers will help with relief efforts in KwaZulu-Natal province, where more than 440 people have died in floods and mudslides and dozens more are missing. A week after the torrential rains began, the South African National Defence Force (SANDF) said on Monday it had been instructed to activate 10,000 troops for tasks including mop-up work and transporting aid. The SANDF would also provide medical support and helicopters for rescue and reconnaissance missions. The floods have left thousands homeless, knocked out …