* Politically connected people tried to tap into PIC - ex-CEO (Adds appointment of interim board): JOHANNESBURG, July 10 (Reuters) - Turmoil in the ruling African National Congress has destabilised South Africa’s state asset manager as rival factions jostle for influence over the multi-billion dollar fund, its former chief executive said on Wednesday. Dan Matjila, who resigned as CEO of the Public Investment Corporation (PIC) last year, told a judicial inquiry into alleged wrongdoing at the money manager that politically connected people had tried to tap into the more than 2 trillion rand ($141 billion) of funds that it oversees.