OSLO (Reuters) - Ex-Bosnian Serb general Rakto Mladic s conviction for war crimes did not come as a surprise, Serbia s prime minister said on Wednesday.  We need to look to the future, so we finally have a stable country,  Ana Brnabic told reporters during a visit to Oslo.  We need to leave the past behind,  she said. A U.N. tribunal convicted Mladic of genocide and crimes against humanity for orchestrating massacres and ethnic cleansing during Bosnia s war and sentenced him to life in prison. 