[ISSUE #8515] Optimize some code in InetUtils

[onewe]

• remove nacos.core.inet.auto-refresh property
• unregistered IPChangeEvent
• add some unit tests for InetUtils

Close #8515

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[codecov-commenter]

Codecov Report

Merging #8522 (3203119) into develop (9e53f7c) will increase coverage by 0.17%.
The diff coverage is 58.53%.

@@              Coverage Diff              @@
##             develop    #8522      +/-   ##
=============================================
+ Coverage      41.24%   41.42%   +0.17%     
- Complexity      4396     4450      +54     
=============================================
  Files            876      882       +6     
  Lines          31868    32120     +252     
  Branches        3708     3719      +11     
=============================================
+ Hits           13145    13306     +161     
- Misses         17406    17472      +66     
- Partials        1317     1342      +25     

Impacted Files	Coverage Δ
...alibaba/nacos/common/executor/ExecutorFactory.java	93.75% <ø> (ø)
...libaba/nacos/common/http/HttpClientBeanHolder.java	0.00% <0.00%> (ø)
...ba/nacos/common/http/client/NacosRestTemplate.java	0.00% <0.00%> (ø)
...n/http/client/handler/AbstractResponseHandler.java	0.00% <0.00%> (ø)
...ommon/http/client/handler/BeanResponseHandler.java	0.00% <0.00%> (ø)
...http/client/handler/RestResultResponseHandler.java	0.00% <0.00%> (ø)
...mon/http/client/handler/StringResponseHandler.java	0.00% <0.00%> (ø)
...ava/com/alibaba/nacos/common/model/RestResult.java	28.94% <0.00%> (ø)
...n/java/com/alibaba/nacos/common/utils/IoUtils.java	9.83% <0.00%> (ø)
...ava/com/alibaba/nacos/common/utils/Observable.java	0.00% <0.00%> (ø)
... and 64 more

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[KomachiSion]

不能移除，这个应该是有用的，修改本机ip，或者修改本机是否使用域名时有用。

[onewe]

@KomachiSion 我看代码,这个没有任何调度器来调度.

nacos/sys/src/main/java/com/alibaba/nacos/sys/utils/InetUtils.java

Line 77 in 8a9f6f8

Runnable ipAutoRefresh = () -> {

这里创建了一个 runnable 后面直接就run了

nacos/sys/src/main/java/com/alibaba/nacos/sys/utils/InetUtils.java

Line 128 in 8a9f6f8

ipAutoRefresh.run();

nacos/sys/src/main/java/com/alibaba/nacos/sys/utils/InetUtils.java

Line 75 in 8a9f6f8

final long delayMs = Long.getLong("nacos.core.inet.auto-refresh", 30_000L);

这个时间也没用到

[KomachiSion]

那是否应该添加个调度器把它调度起来，而不是删掉他？

[onewe]

这玩意儿的单元测试太难写了