Remove duplicate code in RegistryDirectory

[BurningCN]

What is the purpose of the change

The rewritten code is consistent with the parent class and can be removed

[codecov-commenter]

Codecov Report

Merging #7684 (5ef5e24) into master (0ddc988) will decrease coverage by 0.47%.
The diff coverage is 60.78%.

@@             Coverage Diff              @@
##             master    #7684      +/-   ##
============================================
- Coverage     59.17%   58.69%   -0.48%     
+ Complexity      501      492       -9     
============================================
  Files          1079     1076       -3     
  Lines         43331    43504     +173     
  Branches       6318     6340      +22     
============================================
- Hits          25641    25536     -105     
- Misses        14851    15112     +261     
- Partials       2839     2856      +17     

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/apache/dubbo/config/ReferenceConfig.java	65.40% <0.00%> (-4.30%)	0.00 <0.00> (ø)
.../dubbo/registry/integration/RegistryDirectory.java	76.92% <ø> (+1.58%)	0.00 <0.00> (ø)
...e/dubbo/remoting/exchange/codec/ExchangeCodec.java	77.73% <84.21%> (-2.10%)	0.00 <0.00> (ø)
...java/org/apache/dubbo/common/bytecode/Wrapper.java	82.58% <100.00%> (+0.04%)	0.00 <0.00> (ø)
...apache/dubbo/remoting/transport/AbstractCodec.java	79.41% <100.00%> (+4.41%)	0.00 <0.00> (ø)
...e/dubbo/registry/consul/ConsulRegistryFactory.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...he/dubbo/rpc/protocol/rmi/RmiRemoteInvocation.java	0.00% <0.00%> (-80.00%)	0.00% <0.00%> (-2.00%)
...org/apache/dubbo/rpc/protocol/rmi/RmiProtocol.java	0.00% <0.00%> (-61.67%)	0.00% <0.00%> (-10.00%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	0.00% <0.00%> (-60.59%)	0.00% <0.00%> (-31.00%)
...g/context/properties/DefaultDubboConfigBinder.java	42.85% <0.00%> (-57.15%)	0.00% <0.00%> (ø%)
... and 114 more

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