improve shortest path by traversing from less direction

[zhoney]

Change-Id: I630dfa362882e4721a33a0dc42c3e32ea7477022

[codecov]

Codecov Report

Merging #1569 (372faf6) into master (cba3c23) will increase coverage by 17.47%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             master    #1569       +/-   ##
=============================================
+ Coverage     43.96%   61.44%   +17.47%     
- Complexity     4748     6576     +1828     
=============================================
  Files           417      417               
  Lines         34438    34440        +2     
  Branches       4764     4765        +1     
=============================================
+ Hits          15142    21161     +6019     
+ Misses        17552    11088     -6464     
- Partials       1744     2191      +447     

Impacted Files	Coverage Δ
.../algorithm/records/DoubleWayMultiPathsRecords.java	96.66% <100.00%> (+96.66%)	⬆️
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	79.87% <0.00%> (+0.10%)	⬆️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	84.18% <0.00%> (+0.42%)	⬆️
...ava/com/baidu/hugegraph/structure/HugeElement.java	71.68% <0.00%> (+0.45%)	⬆️
...n/java/com/baidu/hugegraph/structure/HugeEdge.java	76.49% <0.00%> (+0.46%)	⬆️
...u/hugegraph/schema/builder/PropertyKeyBuilder.java	89.71% <0.00%> (+0.57%)	⬆️
...aidu/hugegraph/backend/tx/AbstractTransaction.java	72.02% <0.00%> (+0.59%)	⬆️
...om/baidu/hugegraph/task/StandardTaskScheduler.java	75.85% <0.00%> (+0.73%)	⬆️
.../baidu/hugegraph/backend/tx/SchemaTransaction.java	90.43% <0.00%> (+0.79%)	⬆️
.../baidu/hugegraph/backend/query/ConditionQuery.java	86.38% <0.00%> (+0.83%)	⬆️
... and 234 more

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