message: [sql_db_plugin] using move semantic
diff: @@ -29,7 +29,7 @@ template<typename T>
  T fifo<T>::pop()
  {
  std::lock_guard<std::mutex> lock(m_mux);
  - auto e = m_deque.front();
  + auto e = std::move(m_deque.front());
  m_deque.pop_front();
  return e;
  }
  