@Override
  public int hashCode() {
    int result = hostname.hashCode();
    result = 31 * result + portNum;
    return result;
  }
Add new mount paths to current datanode.
@param pathsToAdd a list of mount paths to be added onto current node
ambry-test-utils/src/main/java/com/github/ambry/clustermap/MockDataNodeId.java