message: Add a trace statement for the era seed
diff: @@ -535,6 +535,7 @@ where
  let new_era_id = block_header.era_id().successor();
  info!(?new_era_id, "Era created");
  let seed = EraSupervisor::<I>::era_seed(booking_block_hash, key_block_seed);
  + trace!(%seed, "The seed for era {:?}: {}", new_era_id, seed);
  let results = self.era_supervisor.new_era(
  new_era_id,
  Timestamp::now(), // TODO: This should be passed in.
  