private static Reader reader(String string) {
        return new StringReader(string);
    }
Returns the full list of children (file names) in the given path.

@param path a path relative to the currently active application
@return a list of file names, which is empty (never null) if the path does not exist
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplication.java