@Override
    public void deleteAll(Path path) {
        curator.delete(userRoot.append(path));
    }
Implementation of {@link VespaCurator} which delegates to a {@link Curator}.
This prefixes all paths with {@code "/user"}, to ensure separation with system ZK usage.

@author jonmv
zkfacade/src/main/java/com/yahoo/vespa/curator/CuratorWrapper.java