Enhance ExecutorUtil to create ScheduledThreadPool

[Linary]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2f453c0). Click here to learn what that means.
The diff coverage is 87.5%.

@@            Coverage Diff            @@
##             master      #29   +/-   ##
=========================================
  Coverage          ?   74.53%           
  Complexity        ?      471           
=========================================
  Files             ?       47           
  Lines             ?     1571           
  Branches          ?      234           
=========================================
  Hits              ?     1171           
  Misses            ?      292           
  Partials          ?      108

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (?)
...main/java/com/baidu/hugegraph/rest/RestResult.java	86.66% <100%> (ø)	9 <0> (?)
...main/java/com/baidu/hugegraph/rest/RestClient.java	89.51% <100%> (ø)	34 <0> (?)
...in/java/com/baidu/hugegraph/util/ExecutorUtil.java	81.81% <83.33%> (ø)	3 <2> (?)

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