By Emma Thomasson BERLIN (Reuters) – Oliver Samwer and his brothers Marc and Alexander are on the brink of becoming Germany’s newest billionaires with the flotations of Rocket Internet and the European online fashion site Zalando it helped launch in 2008. The sons of a lawyer who encouraged them to read Germany’s Handelsblatt finance daily, they want to make Rocket the world’s biggest e-commerce platform outside the United States and China by conquering markets that Amazon or Alibaba have yet to dominate. …