Example uses the same value of eureka.client.serviceUrl.defaultZone for all peers. The eureka server knows who it is and doesn't attempt to replicate to itself [1], so this simplification will work. [1]https://github.com/Netflix/eureka/blob/v1.4.10/eureka-core/src/main/java/com/netflix/eureka/registry/PeerAwareInstanceRegistryImpl.java#L616-L619
