Nov 10 (Reuters) - South Africa"s Vodacom Group Ltd (VODJ.J) said on Wednesday it would buy a 55% stake in the Egyptian arm of Vodafone Group Plc (VOD.L) for $2.74 billion. Separately, Vodacom said it would buy a co-controlling 30% stake in assets owned by Community Investment Ventures Holdings including Vumatel and Dark Fibre Africa.