message: Make simulated nodes use different dirs for unit hashes
diff: @@ -103,6 +103,7 @@ impl TestChain {
  // Additionally set up storage in a temporary directory.
  let (storage_cfg, temp_dir) = storage::Config::default_for_tests();
  + cfg.consensus.unit_hashes_folder = temp_dir.path().to_path_buf();
  self.storages.push(temp_dir);
  cfg.storage = storage_cfg;
  