public String getTextualDifference(NodeState other) {
        return getDiff(other).toString();
    }
States are similar if the cluster state doesn't need to be updated due to a change.
Note that min dist bits may need to alter cluster state, but as we don't know at this point, we ignore it.
Cluster state will check for that.
vdslib/src/main/java/com/yahoo/vdslib/state/NodeState.java