public CompletionWaiter createCompletionWaiter(Path barrierPath, String id, Duration waitForAll) {
        return CuratorCompletionWaiter.createAndInitialize(this, barrierPath, id, waitForAll);
    }
For internal use; prefer creating a {@link com.yahoo.vespa.curator.Lock}
zkfacade/src/main/java/com/yahoo/vespa/curator/Curator.java