Method checkPruned

tests/client/TestMetaClient.cc:1473–1476

      return closed.count(inode);
    }
    bool checkPruned(Uuid session) {
      std::lock_guard<std::mutex> lock(mutex);
      return pruned.count(session);
    }
  };

  MockMetaService(bool inject, std::shared_ptr<State> state)