[#3960]fix vertx close may block shutdown

[liubao68]

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[codecov-commenter]

Codecov Report

Merging #3965 (8c88c18) into 2.8.x (863e887) will decrease coverage by 0.02%.
The diff coverage is 66.66%.

❗ Current head 8c88c18 differs from pull request most recent head 0be5c46. Consider uploading reports for the commit 0be5c46 to get more accurate results

@@             Coverage Diff              @@
##              2.8.x    #3965      +/-   ##
============================================
- Coverage     74.23%   74.21%   -0.02%     
  Complexity      703      703              
============================================
  Files          1597     1597              
  Lines         40170    40170              
  Branches       3669     3669              
============================================
- Hits          29820    29814       -6     
- Misses         8860     8864       +4     
- Partials       1490     1492       +2     

Files	Coverage Δ
...pache/servicecomb/foundation/vertx/VertxUtils.java	78.75% <66.66%> (ø)

... and 2 files with indirect coverage changes

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