private static Set<String> getPaths(FileRegistry fileRegistry) {
        Set<String> paths = new LinkedHashSet<>();
        synchronized (fileRegistry) {
            for (FileRegistry.Entry e : fileRegistry.export()) {
                paths.add(e.relativePath);
            }
        }
        return paths;
    }
Returns readers for all the children of a node.
The node is looked up relative to the location of the active application package in zookeeper.
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationPackage.java