Fix load time and rate of vertex/edge is inaccurate

[Linary]

Change-Id: Ibe3a5aa94c67d43225bdd668af9881f86e6c1e81

[codecov]

Codecov Report

Merging #200 (49147ff) into master (cf81bb2) will increase coverage by 0.49%.
The diff coverage is 97.56%.

@@             Coverage Diff              @@
##             master     #200      +/-   ##
============================================
+ Coverage     72.90%   73.39%   +0.49%     
- Complexity      829      848      +19     
============================================
  Files            79       80       +1     
  Lines          3499     3571      +72     
  Branches        425      429       +4     
============================================
+ Hits           2551     2621      +70     
  Misses          749      749              
- Partials        199      201       +2     

Impacted Files	Coverage Δ	Complexity Δ
...m/baidu/hugegraph/loader/task/BatchInsertTask.java	37.20% <ø> (ø)	4.00 <0.00> (ø)
.../baidu/hugegraph/loader/task/SingleInsertTask.java	69.23% <ø> (ø)	9.00 <0.00> (ø)
...om/baidu/hugegraph/loader/metrics/RangesTimer.java	94.87% <94.87%> (ø)	10.00 <10.00> (?)
...va/com/baidu/hugegraph/loader/HugeGraphLoader.java	91.17% <100.00%> (+0.32%)	38.00 <3.00> (ø)
...om/baidu/hugegraph/loader/metrics/LoadSummary.java	91.66% <100.00%> (+2.30%)	27.00 <11.00> (+8.00)
...va/com/baidu/hugegraph/loader/task/InsertTask.java	95.91% <100.00%> (+0.46%)	15.00 <1.00> (+1.00)
...a/com/baidu/hugegraph/loader/task/TaskManager.java	75.00% <100.00%> (+2.69%)	11.00 <4.00> (ø)
.../java/com/baidu/hugegraph/loader/util/Printer.java	90.99% <100.00%> (+0.16%)	22.00 <0.00> (ø)

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