By Promit Mukherjee and Emma Rumney JOHANNESBURG (Reuters) – Coca-Cola’s estimated $3 billion initial public offering (IPO) for its African bottling unit will likely take place in the third quarter after market turmoil linked to the war in Ukraine upset plans to list earlier, three sources said on Tuesday. The flotation of Coca-Cola Beverages Africa (CCBA) would be the biggest on the Johannesburg Stock Exchange since at least 2016 and a major boost for the flagging index. But Moscow’s invasion of Ukraine has shaken investor confidence and contributed to a plunge in volumes of IPOs in Europe, t…