private static Path getZKPath(Path path) {
        if (path.isRoot()) {
            return Path.fromString(USERAPP_ZK_SUBPATH);
        }
        return Path.fromString(USERAPP_ZK_SUBPATH).append(path);
    }
@author Ulf Lilleengen
@author Vegard Havdal
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationFile.java