Apollo config center optimization, use 'dubbo.properties' as default namespace for properties.

[chickenlj]

No description provided.

[CodingSinger]

这样改有点问题，org.apache.dubbo.config.AbstractInterfaceConfig#prepareEnvironment这个方法中的对appConfigFile的获取就会失去原来的语义了，不再从名为application name这个namespace中获取。

[CodingSinger]

看了一下，getProperties方法大概只被启动初始化的org.apache.dubbo.config.AbstractInterfaceConfig#prepareEnvironment用到，我建议是否可以考虑修改该方法，保留原来的语义，即将group作为apollo namespace，并且application name作为app cloud config?

[codecov-io]

Codecov Report

Merging #5105 into 2.7.4-release will decrease coverage by 0.01%.
The diff coverage is 0%.

@@                 Coverage Diff                 @@
##             2.7.4-release    #5105      +/-   ##
===================================================
- Coverage               64%   63.98%   -0.02%     
- Complexity             451      452       +1     
===================================================
  Files                  770      770              
  Lines                33235    33268      +33     
  Branches              5224     5250      +26     
===================================================
+ Hits                 21271    21288      +17     
- Misses                9533     9549      +16     
  Partials              2431     2431

Impacted Files	Coverage Δ	Complexity Δ
...ter/support/apollo/ApolloDynamicConfiguration.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	65.85% <0%> (-17.08%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-4.35%)	0% <0%> (ø)
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0%> (-3.85%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	64.75% <0%> (-2.46%)	0% <0%> (ø)
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	56.47% <0%> (-2.36%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	64.77% <0%> (-2.28%)	0% <0%> (ø)
... and 23 more

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