[Dubbo-4716] Fix judgment ipv4 address

[kaori-seasons]

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Brief changelog

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Verifying this change

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[codecov-io]

Codecov Report

Merging #4729 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #4729      +/-   ##
============================================
- Coverage     63.93%   63.92%   -0.01%     
+ Complexity      451      450       -1     
============================================
  Files           769      769              
  Lines         33160    33179      +19     
  Branches       5226     5229       +3     
============================================
+ Hits          21200    21210      +10     
- Misses         9543     9547       +4     
- Partials       2417     2422       +5

Impacted Files	Coverage Δ	Complexity Δ
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (ø)	0 <0> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...he/dubbo/remoting/transport/netty/NettyServer.java	69.64% <0%> (-3.58%)	8% <0%> (-1%)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80% <0%> (-3.34%)	0% <0%> (ø)
...ava/org/apache/dubbo/config/ApplicationConfig.java	88.33% <0%> (-2.9%)	0% <0%> (ø)
...ava/org/apache/dubbo/common/utils/StringUtils.java	84.01% <0%> (-0.84%)	0% <0%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <0%> (-0.63%)	29% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0%> (ø)	0% <0%> (ø)	⬇️
...e/dubbo/registry/integration/RegistryProtocol.java	82.69% <0%> (ø)	0% <0%> (ø)	⬇️
...ubbo/metadata/store/redis/RedisMetadataReport.java	55.55% <0%> (+1.26%)	6% <0%> (ø)	⬇️
... and 3 more

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[htynkn]

Could you please provide some detail for this PR?

[kaori-seasons]

Could you please provide some detail for this PR?

@htynkn ,These two commits are

• fix ipv4 address judgment error in order to solve (org.apache.dubbo.registry.multicast.MulticastRegistry#checkMulticastAddress #4716) issue

• fix the classloader of the MetadataReportService used by Class.forName in the #4712 issue, so try to build a classLoader to pass to the thread context, but I don't know why the check failed.

[tswstarplanet]

Your repository seems not clean. Please follow the steps in CONTRIBUTING.md

[kaori-seasons]

Your repository seems not clean. Please follow the steps in CONTRIBUTING.md

Your repository seems not clean. Please follow the steps in CONTRIBUTING.md

@tswstarplanet
Hello, I have emptied the extra files

[tswstarplanet]

LGTM