[compatible] Registry compatibility #3882

[cvictory]

What is the purpose of the change

fix #3882

Brief changelog

Registry compatibility: add some abstract class compatible.

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #4015 into master will decrease coverage by 0.27%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             master   #4015      +/-   ##
===========================================
- Coverage     63.47%   63.2%   -0.28%     
  Complexity      565     565              
===========================================
  Files           750     759       +9     
  Lines         32415   32908     +493     
  Branches       5145    5218      +73     
===========================================
+ Hits          20577   20799     +222     
- Misses         9480    9750     +270     
- Partials       2358    2359       +1

Impacted Files	Coverage Δ	Complexity Δ
...pache/dubbo/registry/support/FailbackRegistry.java	74.28% <ø> (ø)	0 <0> (ø)	⬇️
...ibaba/dubbo/registry/support/FailbackRegistry.java	0% <0%> (ø)	0 <0> (?)
...ibaba/dubbo/registry/support/AbstractRegistry.java	0% <0%> (ø)	0 <0> (?)
...ubbo/registry/support/AbstractRegistryFactory.java	0% <0%> (ø)	0 <0> (?)
.../java/com/alibaba/dubbo/common/utils/UrlUtils.java	0% <0%> (ø)	0 <0> (?)
...ava/org/apache/dubbo/common/utils/StringUtils.java	86.22% <0%> (-0.69%)	0 <0> (ø)
...ava/com/alibaba/dubbo/registry/NotifyListener.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...onfig/spring/extension/SpringExtensionFactory.java	78.04% <0%> (-7.32%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	57.14% <0%> (-5.72%)	0% <0%> (ø)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0%> (-5.67%)	0% <0%> (ø)
... and 35 more

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[Moriadry-zz]

a little request changes.

[chickenlj]

LGTM