注册到eureka服务端 显示IP:服务名:端口的格式

spring cloud 版本：

Finchley.SR2 

eureka:
  instance:
    instance-id: ${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}
    prefer-ip-address: true

Dalston.SR5

eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ipAddress}:${spring.application.name}:${server.port}