fix Issue 8516 on branch 3.0: fix mock:true configuration.

[changfubai]

same as #8520

[codecov-commenter]

Codecov Report

Merging #8558 (8ea3304) into 3.0 (5630a3c) will increase coverage by 0.04%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##                3.0    #8558      +/-   ##
============================================
+ Coverage     62.93%   62.98%   +0.04%     
+ Complexity      313      311       -2     
============================================
  Files          1117     1117              
  Lines         46735    46736       +1     
  Branches       7032     7033       +1     
============================================
+ Hits          29414    29435      +21     
+ Misses        14063    14041      -22     
- Partials       3258     3260       +2     

Impacted Files	Coverage Δ
...java/org/apache/dubbo/rpc/support/MockInvoker.java	84.42% <66.66%> (-0.70%)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	54.54% <0.00%> (-5.69%)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	79.20% <0.00%> (ø)
...vent/listener/ServiceInstancesChangedListener.java	78.10% <0.00%> (+0.49%)	⬆️
...he/dubbo/registry/multicast/MulticastRegistry.java	67.59% <0.00%> (+0.92%)	⬆️
...ting/zookeeper/curator/CuratorZookeeperClient.java	72.41% <0.00%> (+0.98%)	⬆️
.../dubbo/remoting/transport/netty4/NettyChannel.java	66.33% <0.00%> (+1.98%)	⬆️
...pache/dubbo/registry/support/AbstractRegistry.java	79.56% <0.00%> (+2.91%)	⬆️
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0.00%> (+4.34%)	⬆️
...dubbo/remoting/exchange/support/DefaultFuture.java	93.85% <0.00%> (+4.38%)	⬆️
... and 1 more

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[BurningCN]

The name of pr should be more specific, such as what problem is fixed

[changfubai]

The name of pr should be more specific, such as what problem is fixed

ok.thanks