public List<Node> makeReadyChildren(int n, NodeResources resources, String parentHostname) {
        return makeReadyChildren(n, 1, resources, parentHostname,
                                     index -> String.format("%s-%03d", parentHostname, index));
    }
Create one or more child nodes on a single host starting with index 1
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/ProvisioningTester.java