优化springcloud双注册场景，DiscoveryClientInterceptor/DiscoveryClientServiceInterceptor处理逻辑

[TangLeDaily]

【修复issue】#1242

【修改内容】
1、修改了com.huawei.registry.interceptors.DiscoveryClientInterceptor/DiscoveryClientServiceInterceptor的拦截逻辑，去掉线程变量，修改合并方式
2、修改了相应的UT

【用例描述】功能不变，不需要修改用例

【自测情况】本地静态检查通过、UT通过

【影响范围】不涉及

[codecov]

Codecov Report

Patch coverage: 78.43% and project coverage change: +0.37% 🎉

Comparison is base (4427972) 42.00% compared to head (410a241) 42.37%.
Report is 15 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1267      +/-   ##
=============================================
+ Coverage      42.00%   42.37%   +0.37%     
- Complexity      3197     3232      +35     
=============================================
  Files            815      821       +6     
  Lines          17740    17894     +154     
  Branches        1934     1950      +16     
=============================================
+ Hits            7451     7583     +132     
- Misses          9358     9360       +2     
- Partials         931      951      +20     

Flag	Coverage Δ
unittests	42.37% <78.43%> (+0.37%)	⬆️

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

Files Changed	Coverage Δ
...try/interceptors/DynamicServerListInterceptor.java	58.06% <0.00%> (ø)
...nterceptors/DiscoveryClientServiceInterceptor.java	69.23% <76.47%> (ø)
...istry/interceptors/DiscoveryClientInterceptor.java	86.66% <83.33%> (+14.16%)	⬆️
...i/registry/support/InstanceInterceptorSupport.java	84.00% <100.00%> (+6.58%)	⬆️

... and 51 files with indirect coverage changes

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