message: make the Genesis leader selection as non implemented
diff: @@ -39,7 +39,7 @@ impl property::LeaderSelection for LeaderSelection {
  LeaderSelection::BFT(ref bft) => {
  update.bft = property::LeaderSelection::diff(bft, input).map_err(Error::Bft)?;
  }
  - LeaderSelection::Genesis => {}
  + LeaderSelection::Genesis => unimplemented!(),
  }
  Ok(update)
  @@ -49,7 +49,7 @@ impl property::LeaderSelection for LeaderSelection {
  LeaderSelection::BFT(ref mut bft) => {
  property::LeaderSelection::apply(bft, update.bft).map_err(Error::Bft)?;
  }
  - LeaderSelection::Genesis => {}
  + LeaderSelection::Genesis => unimplemented!(),
  }
  Ok(())
  }
  