Spring Cloud Netflix OUT_OF_SERVICE的Node被莫名其妙的删除，导致重新注册为UP

Describe the bug Please provide details of the problem, including the version of Spring Cloud that you are using.

Sample If possible, please provide a test case or sample application that reproduces the problem. This makes it much easier for us to diagnose the problem and to verify that we have fixed it.

Comment From: www147258

eureka client版本1.7.2

spring cloud 版本1.4.5