private Optional<AllocatedHosts> importAllocatedHosts() {
        if ( ! zkApplication.exists(Path.fromString(allocatedHostsNode))) return Optional.empty();
        return Optional.of(readAllocatedHosts());
    }
Represents an application residing in zookeeper.

@author Tony Vaagenes
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationPackage.java