[SCB-2771]fix MicroserviceVersions concurrent access problem

[liubao68]

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[codecov-commenter]

Codecov Report

Merging #3637 (736bfbd) into master (83cba93) will increase coverage by 0.01%.
The diff coverage is 47.36%.

❗ Current head 736bfbd differs from pull request most recent head 5e83579. Consider uploading reports for the commit 5e83579 to get more accurate results

@@             Coverage Diff              @@
##             master    #3637      +/-   ##
============================================
+ Coverage     42.87%   42.88%   +0.01%     
- Complexity     5966     5969       +3     
============================================
  Files          1554     1554              
  Lines         38817    38831      +14     
  Branches       3558     3561       +3     
============================================
+ Hits          16642    16654      +12     
- Misses        20885    20886       +1     
- Partials       1290     1291       +1     

Impacted Files	Coverage Δ
...cecomb/registry/consumer/MicroserviceVersions.java	66.66% <37.50%> (+0.28%)	⬆️
...b/transport/rest/client/TransportClientConfig.java	83.33% <50.00%> (-4.91%)	⬇️
...est/client/Http2TransportHttpClientOptionsSPI.java	100.00% <100.00%> (ø)
...comb/core/definition/MicroserviceVersionsMeta.java	96.00% <0.00%> (-4.00%)	⬇️
...he/servicecomb/foundation/common/net/NetUtils.java	30.40% <0.00%> (+1.59%)	⬆️
.../servicecomb/registry/discovery/DiscoveryTree.java	80.32% <0.00%> (+3.27%)	⬆️

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