Fix rate inaccurate when print progress

[Linary]

Change-Id: Ifb7eccde1f54ca1cf63f578db2b8e8d1a0736a73

[codecov]

Codecov Report

Merging #205 (22c6cd0) into master (9b2bb32) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #205      +/-   ##
============================================
+ Coverage     73.39%   73.44%   +0.04%     
  Complexity      848      848              
============================================
  Files            80       80              
  Lines          3571     3577       +6     
  Branches        429      429              
============================================
+ Hits           2621     2627       +6     
  Misses          749      749              
  Partials        201      201              

Impacted Files	Coverage Δ	Complexity Δ
...va/com/baidu/hugegraph/loader/HugeGraphLoader.java	91.17% <100.00%> (ø)	38.00 <0.00> (ø)
...om/baidu/hugegraph/loader/metrics/LoadSummary.java	91.80% <100.00%> (+0.13%)	27.00 <4.00> (ø)
...om/baidu/hugegraph/loader/metrics/RangesTimer.java	94.87% <100.00%> (ø)	10.00 <0.00> (ø)
.../java/com/baidu/hugegraph/loader/util/Printer.java	91.37% <100.00%> (+0.38%)	22.00 <1.00> (ø)

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