Improve some params in config and test

[Linary]

Change-Id: I474b8317582c5884fb2e92e14127bf123e1e4afe

[codecov]

Codecov Report

Merging #204 (67eb6db) into master (707bee6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #204   +/-   ##
=========================================
  Coverage     73.39%   73.39%           
  Complexity      848      848           
=========================================
  Files            80       80           
  Lines          3571     3571           
  Branches        429      429           
=========================================
  Hits           2621     2621           
  Misses          749      749           
  Partials        201      201           

Impacted Files	Coverage Δ	Complexity Δ
...com/baidu/hugegraph/loader/constant/Constants.java	75.00% <ø> (ø)	1.00 <0.00> (ø)
.../baidu/hugegraph/loader/util/HugeClientHolder.java	25.49% <ø> (ø)	5.00 <0.00> (ø)

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