message: Fix segfault during ITF destruction
diff: @@ -302,15 +302,15 @@ class Irohad {
  // block loader
  std::shared_ptr<iroha::network::BlockLoader> block_loader;
  + // synchronizer
  + std::shared_ptr<iroha::synchronizer::Synchronizer> synchronizer;
  +
  // consensus gate
  std::shared_ptr<iroha::network::ConsensusGate> consensus_gate;
  rxcpp::composite_subscription consensus_gate_objects_lifetime;
  rxcpp::subjects::subject<iroha::consensus::GateObject> consensus_gate_objects;
  rxcpp::composite_subscription consensus_gate_events_subscription;
  - // synchronizer
  - std::shared_ptr<iroha::synchronizer::Synchronizer> synchronizer;
  -
  // pcs
  std::shared_ptr<iroha::network::PeerCommunicationService> pcs;
  