[3.0] set client to null at LazyConnectExchangeClient close methods

[zrlw]

What is the purpose of the change

#8880

• set the client field of LazyConnectExchangeClient to null at the end of close() and close(int timeout) methods
• move close status setting from HeaderExchangeChannel close(timeout) to close()

[codecov-commenter]

Codecov Report

Merging #8881 (c034b72) into 3.0 (eb574aa) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##                3.0    #8881      +/-   ##
============================================
+ Coverage     63.38%   63.40%   +0.01%     
- Complexity      314      315       +1     
============================================
  Files          1178     1178              
  Lines         49810    49815       +5     
  Branches       7452     7452              
============================================
+ Hits          31571    31583      +12     
+ Misses        14796    14787       -9     
- Partials       3443     3445       +2     

Impacted Files	Coverage Δ
...exchange/support/header/HeaderExchangeChannel.java	78.84% <33.33%> (-1.55%)	⬇️
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	55.91% <100.00%> (-2.33%)	⬇️
...c/protocol/dubbo/ReferenceCountExchangeClient.java	65.00% <100.00%> (ø)
...pache/dubbo/remoting/transport/AbstractClient.java	61.42% <0.00%> (-4.29%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	60.86% <0.00%> (-2.18%)	⬇️
...stry/client/ServiceDiscoveryRegistryDirectory.java	46.25% <0.00%> (-0.89%)	⬇️
...he/dubbo/registry/zookeeper/ZookeeperRegistry.java	66.04% <0.00%> (+0.21%)	⬆️
...n/java/org/apache/dubbo/common/utils/NetUtils.java	69.03% <0.00%> (+0.32%)	⬆️
...dubbo/remoting/exchange/support/DefaultFuture.java	89.18% <0.00%> (+0.90%)	⬆️
... and 9 more

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[wangchengming666]

LGTM