@AfterEach
    public void tearDown() {
        fleetControllers.forEach(f -> {
            try {
                f.shutdown();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        });
        fleetControllers.clear();
        if (nodes != null) for (DummyVdsNode node : nodes) {
            node.shutdown();
            nodes = null;
        }
        slobrok.stop();
    }
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