static Set<ConfiguredNode> asConfiguredNodes(Set<Integer> indices) {
        return indices.stream().map(idx -> new ConfiguredNode(idx, false)).collect(Collectors.toSet());
    }
Creates dummy vds nodes for the list of configured nodes and returns them.
As two dummy nodes are created for each configured node - one distributor and one storage node -
the returned list is twice as large as configuredNodes.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/FleetControllerTest.java