message: only do the watermark initialization for producers on this node
diff: @@ -474,6 +474,7 @@ block_production_condition::block_production_condition_enum producer_plugin_impl
  flat_set<account_name> new_producers;
  new_producers.reserve(new_bs->active_schedule.producers.size());
  for( const auto& p: new_bs->active_schedule.producers) {
  + if (_producers.count(p.producer_name) > 0)
  new_producers.insert(p.producer_name);
  }
  