String applicationInstanceSuspendedPath(ApplicationInstanceReference reference) {
        return APPLICATION_STATUS_BASE_PATH + "/" + OrchestratorUtil.toRestApiFormat(reference);
    }
Remove the application from ZooKeeper.

<ol>
    <li>/vespa/host-status/APPLICATION_ID (should just be ./hosts/*)</li>
    <li>/vespa/host-status-service/REFERENCE/hosts-allowed-down  (should just be ./*)</li>
    <li>/vespa/application-status-service/REFERENCE  (should just be .)</li>
</ol>
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/status/ZkStatusService.java