add LimitIterator class

[javeme]

Change-Id: Iec3c3d9876b23bda0897089585b8993f7665f0ac

[codecov[bot]]

Codecov Report

Merging #62 (3dc10b8) into master (cde7763) will increase coverage by 0.01%. The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     84.79%   84.80%   +0.01%     
- Complexity      758      767       +9     
============================================
  Files            59       60       +1     
  Lines          2183     2205      +22     
  Branches        321      324       +3     
============================================
+ Hits           1851     1870      +19     
- Misses          190      191       +1     
- Partials        142      144       +2     

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50.00% <ø> (ø)	1.00 <0.00> (ø)
...va/com/baidu/hugegraph/iterator/LimitIterator.java	81.81% <81.81%> (ø)	8.00 <8.00> (?)
.../main/java/com/baidu/hugegraph/event/EventHub.java	80.55% <0.00%> (-1.39%)	26.00% <0.00%> (-1.00%)
.../main/java/com/baidu/hugegraph/perf/Stopwatch.java	87.75% <0.00%> (+2.04%)	21.00% <0.00%> (+1.00%)
...a/com/baidu/hugegraph/iterator/FilterIterator.java	85.71% <0.00%> (+7.14%)	7.00% <0.00%> (+1.00%)

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[javeme]

ci error: in RestClientTest.testCleanExecutor() at Mockito.verify(pool, Mockito.never()).closeExpiredConnections();