@Override
  public void close() {
    compNetworkClient.close();
  }
Warm up connections to dataNodes in a specified time window.
@param dataNodeIds warm up target nodes.
@param connectionWarmUpPercentagePerDataNode percentage of max connections would like to establish in the warmup.
@param timeForWarmUp max time to wait for connections' establish in milliseconds.
@param responseInfoList records responses from disconnected connections.
@return number of connections established successfully.
ambry-router/src/test/java/com/github/ambry/router/MockCompositeNetworkClient.java