private void importFileRegistries(AddFileInterface fileManager) {
        List<String> perVersionFileRegistryNodes = zkApplication.getChildren(Path.fromString(fileRegistryNode));
        perVersionFileRegistryNodes
                .forEach(version -> fileRegistryMap.put(Version.fromString(version),
                                                        importFileRegistry(fileManager, Joiner.on("/").join(fileRegistryNode, version))));
    }
Reads allocated hosts at the given node.

@return the allocated hosts at this node or empty if there is no data at this path
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationPackage.java