JOHANNESBURG (Reuters) - Voting for the new leader of South Africa s ruling ANC ended on Monday about ten hours after delegates began casting ballots for either Deputy President Cyril Ramaphosa or Nkosazana Dlamini-Zuma, a senior party source told Reuters.  Voting for top 6 is done,  said the source, referring to the position of president of the African National Congress and the party s five other senior posts. 