[dubbo_4344]fixspi配置多个tag解析错误问题(#4344)

[zishinan]

What is the purpose of the change

#4344

Brief changelog

修改ExtensionLoader中的错误代码

Verifying this change

加入测试用例testMultiNames验证该bug

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[codecov-io]

Codecov Report

Merging #4346 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #4346      +/-   ##
============================================
+ Coverage     62.85%   62.88%   +0.02%     
- Complexity      449      451       +2     
============================================
  Files           769      769              
  Lines         32995    32995              
  Branches       5215     5215              
============================================
+ Hits          20740    20749       +9     
+ Misses         9849     9846       -3     
+ Partials       2406     2400       -6

Impacted Files	Coverage Δ	Complexity Δ
...apache/dubbo/common/extension/ExtensionLoader.java	79.37% <100%> (+0.26%)	0 <0> (ø)	⬇️
...onfig/spring/extension/SpringExtensionFactory.java	78.04% <0%> (-7.32%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	78.54% <0%> (-1.54%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0%> (-0.95%)	0% <0%> (ø)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.26% <0%> (+0.66%)	27% <0%> (ø)	⬇️
...ache/dubbo/registry/multiple/MultipleRegistry.java	63.38% <0%> (+0.7%)	21% <0%> (+1%)	⬆️
...bo/rpc/cluster/support/FailbackClusterInvoker.java	70.49% <0%> (+3.27%)	0% <0%> (ø)	⬇️
...c/main/java/org/apache/dubbo/rpc/RpcException.java	86.2% <0%> (+3.44%)	0% <0%> (ø)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	62.35% <0%> (+4.7%)	21% <0%> (+1%)	⬆️
... and 1 more

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[Leishunyu]

LGTM!

[chickenlj]

LGTM