[#3881] update init cse server address choose index for random

[chengyouling]

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[codecov-commenter]

Codecov Report

Merging #3883 (d2d455b) into 2.8.x (020ca25) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

❗ Current head d2d455b differs from pull request most recent head bed8773. Consider uploading reports for the commit bed8773 to get more accurate results

@@             Coverage Diff              @@
##              2.8.x    #3883      +/-   ##
============================================
- Coverage     74.44%   74.44%   -0.01%     
  Complexity      690      690              
============================================
  Files          1592     1592              
  Lines         39983    39985       +2     
  Branches       3646     3648       +2     
============================================
  Hits          29766    29766              
+ Misses         8733     8732       -1     
- Partials       1484     1487       +3     

Files Changed	Coverage Δ
...omb/http/client/common/AbstractAddressManager.java	75.88% <66.66%> (-0.38%)	⬇️

... and 3 files with indirect coverage changes

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