@Override
    public int hashCode() {
        int res = 17;
        for (Object child : getChildren().values())
            res = 31 * res + child.hashCode();
        return res;
     }
Overrides {@link Node#postInitialize(String)}.
Perform post initialization on this node's children.

@param configId The config id of this instance.
config-lib/src/main/java/com/yahoo/config/InnerNode.java