close tx in vertex/edge query only if needed

[zhoney]

Change-Id: I0cc7b3897700449c9215e722e3e9e814f27a1b33

[codecov]

Codecov Report

Merging #1039 into master will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #1039      +/-   ##
============================================
- Coverage     69.13%   69.12%   -0.01%     
  Complexity     5422     5422              
============================================
  Files           329      329              
  Lines         26372    26376       +4     
  Branches       3757     3761       +4     
============================================
+ Hits          18231    18232       +1     
+ Misses         6360     6359       -1     
- Partials       1781     1785       +4     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/baidu/hugegraph/api/graph/EdgeAPI.java	54.68% <50.00%> (-0.58%)	0.00 <0.00> (ø)
.../java/com/baidu/hugegraph/api/graph/VertexAPI.java	36.80% <50.00%> (-0.46%)	0.00 <0.00> (ø)
...om/baidu/hugegraph/task/StandardTaskScheduler.java	86.52% <0.00%> (+0.35%)	68.00% <0.00%> (ø%)

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