dubbo2.7.x does not register serviceNameMapping information with the registry by default.

[xiaoheng1]

What is the purpose of the change

dubbo2.7.x does not register serviceNameMapping information with the registry by default.

see more detail from #7670

Brief changelog

Verifying this change

• Make sure there is a GitHub_issue field 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.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist #XXX. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• 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 sample in dubbo samples project.
• Run mvn clean install -DskipTests=false & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
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[codecov-commenter]

Codecov Report

Merging #7672 (62dae40) into master (2201510) will decrease coverage by 0.03%.
The diff coverage is 28.57%.

@@             Coverage Diff              @@
##             master    #7672      +/-   ##
============================================
- Coverage     59.18%   59.14%   -0.04%     
  Complexity      529      529              
============================================
  Files          1076     1076              
  Lines         43465    43474       +9     
  Branches       6355     6356       +1     
============================================
- Hits          25726    25714      -12     
- Misses        14900    14917      +17     
- Partials       2839     2843       +4     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/org/apache/dubbo/config/ServiceConfig.java	60.59% <28.57%> (-1.37%)	0.00 <0.00> (ø)
...tadata/DynamicConfigurationServiceNameMapping.java	47.36% <0.00%> (-36.85%)	0.00% <0.00%> (ø%)
...nfig/configcenter/nop/NopDynamicConfiguration.java	75.00% <0.00%> (-12.50%)	0.00% <0.00%> (ø%)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80.00% <0.00%> (-3.34%)	0.00% <0.00%> (ø%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.38% <0.00%> (-2.98%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	16.00% <0.00%> (ø%)
...apache/dubbo/common/extension/ExtensionLoader.java	78.17% <0.00%> (-0.23%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	89.65% <0.00%> (ø)	0.00% <0.00%> (ø%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.58% <0.00%> (+0.58%)	31.00% <0.00%> (ø%)
... and 3 more

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[AlbumenJ]

LGTM.