support calling superclass method for Whitebox.invoke()

[javeme]

Change-Id: I36b460d1a95b4f063ccd329d2058e4e80ebb71c0

[codecov]

Codecov Report

Merging #37 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #37      +/-   ##
============================================
+ Coverage     75.19%   75.33%   +0.13%     
- Complexity      495      498       +3     
============================================
  Files            48       48              
  Lines          1657     1662       +5     
  Branches        252      253       +1     
============================================
+ Hits           1246     1252       +6     
  Misses          300      300              
+ Partials        111      110       -1

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (ø)	⬇️
...in/java/com/baidu/hugegraph/testutil/Whitebox.java	89.61% <100%> (+0.72%)	22 <4> (+2)	⬆️
.../main/java/com/baidu/hugegraph/event/EventHub.java	81.94% <0%> (+1.38%)	27% <0%> (+1%)	⬆️

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