void updateWithNewConfig(StorDistributionConfig newConfig) throws Exception {
            ctrl.updateOptions(options.setDistributionConfig(newConfig).build());
            ctrl.tick(); // Propagate options internally
            ctrl.tick(); // New options actually take effect
        }
Class for testing states of all nodes. Will fail in constructor with
debug message on non-expected results.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java