add compatible class for config #2169

[diecui1202]

What is the purpose of the change

add compatible class for config

Brief changelog

dubbo-compatible

Verifying this change

add unit tests

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• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
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[codecov-io]

Codecov Report

Merging #2170 into master will decrease coverage by <.01%.
The diff coverage is 60%.

@@             Coverage Diff             @@
##             master   #2170      +/-   ##
===========================================
- Coverage      54.3%   54.3%   -0.01%     
- Complexity     5111    5120       +9     
===========================================
  Files           559     569      +10     
  Lines         24981   25016      +35     
  Branches       4453    4453              
===========================================
+ Hits          13566   13584      +18     
- Misses         9380    9394      +14     
- Partials       2035    2038       +3

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/alibaba/dubbo/config/MethodConfig.java	100% <100%> (ø)	1 <1> (?)
.../java/com/alibaba/dubbo/config/ConsumerConfig.java	100% <100%> (ø)	1 <1> (?)
.../java/com/alibaba/dubbo/config/ArgumentConfig.java	100% <100%> (ø)	1 <1> (?)
...va/com/alibaba/dubbo/config/ApplicationConfig.java	100% <100%> (ø)	2 <2> (?)
.../java/com/alibaba/dubbo/config/ProtocolConfig.java	33.33% <33.33%> (ø)	1 <1> (?)
...java/com/alibaba/dubbo/config/ReferenceConfig.java	50% <50%> (ø)	1 <1> (?)
...n/java/com/alibaba/dubbo/config/MonitorConfig.java	50% <50%> (ø)	1 <1> (?)
...n/java/com/alibaba/dubbo/config/ServiceConfig.java	50% <50%> (ø)	1 <1> (?)
...in/java/com/alibaba/dubbo/config/ModuleConfig.java	50% <50%> (ø)	1 <1> (?)
.../java/com/alibaba/dubbo/config/RegistryConfig.java	66.66% <66.66%> (ø)	2 <2> (?)
... and 18 more

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