message: remove discrimination for setting
diff: @@ -7,7 +7,6 @@ use crate::{
  key::Hash,
  leadership::bft,
  };
  -use chain_addr::Discrimination;
  use chain_core::mempack::{read_vec, ReadBuf, ReadError, Readable};
  use chain_core::property;
  use std::sync::Arc;
  