improve int set/map test

[javeme]

Change-Id: Ie252a89f9e4e003803737c6311a29cb4ff5a536c

[codecov]

Codecov Report

Merging #1712 (f3ece21) into master (1d031c5) will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1712      +/-   ##
============================================
+ Coverage     66.91%   66.97%   +0.06%     
  Complexity     7102     7102              
============================================
  Files           423      423              
  Lines         35528    35528              
  Branches       4944     4944              
============================================
+ Hits          23773    23796      +23     
+ Misses         9365     9344      -21     
+ Partials       2390     2388       -2     

Impacted Files	Coverage Δ
...va/com/baidu/hugegraph/util/collection/IntSet.java	75.31% <0.00%> (+4.25%)	⬆️
...va/com/baidu/hugegraph/util/collection/IntMap.java	72.40% <0.00%> (+5.20%)	⬆️

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[imbajin]

TODO: mysql/pg start failed will deal in another PR