@Override
                public ConfigDefinition parse() {
                    DefParser parser = new DefParser(key.getName(), retrieveConfigDefReader(nodeName));
                    return ConfigDefinitionBuilder.createConfigDefinition(parser.getTree());
                }
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