微服務註冊進eureka集羣

只需添加eureka集羣服務器地址，並且用逗號隔開
例如localhost的7001-7003三臺eureka服務器搭建的集羣

server:
  port: 8001
eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:7001/eureka/,http://127.0.0.1:7002/eureka/,http://127.0.0.1:7003/eureka/
  instance:
    prefer-ip-address: true #跨域訪問