【fix】修复优雅上下线ut

[provenceee]

【修复issue】 #1115

【修改内容】修复优雅上下线ut

【用例描述】SpringZuulResponseInterceptorTest失败

【自测情况】SpringZuulResponseInterceptorTest成功

【影响范围】不涉及

[codecov]

Codecov Report

Patch coverage: 85.18% and project coverage change: +0.02 🎉

Comparison is base (9faa151) 43.53% compared to head (e88aac3) 43.55%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1130      +/-   ##
=============================================
+ Coverage      43.53%   43.55%   +0.02%     
- Complexity      3025     3027       +2     
=============================================
  Files            748      748              
  Lines          16064    16067       +3     
  Branches        1742     1740       -2     
=============================================
+ Hits            6993     6998       +5     
+ Misses          8198     8197       -1     
+ Partials         873      872       -1     

Flag	Coverage Δ
unittests	43.55% <85.18%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ei/registry/config/grace/GraceShutDownManager.java	68.08% <50.00%> (-1.69%)	⬇️
...huawei/registry/service/utils/HttpClientUtils.java	85.71% <60.00%> (-4.29%)	⬇️
...rs/SpringLoadbalancerFeignResponseInterceptor.java	77.27% <100.00%> (+5.27%)	⬆️
...ngLoadbalancerRestTemplateResponseInterceptor.java	83.33% <100.00%> (+8.33%)	⬆️
...ce/interceptors/SpringZuulResponseInterceptor.java	82.35% <100.00%> (+8.66%)	⬆️
...egistry/inject/grace/SpringRequestInterceptor.java	78.57% <100.00%> (+1.64%)	⬆️
...huawei/registry/service/impl/GraceServiceImpl.java	75.00% <100.00%> (+1.92%)	⬆️
...wei/registry/service/server/NotifyHttpHandler.java	80.00% <100.00%> (ø)

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[robotLJW]

/lgtm