test: adapt for server OLTP algorithm ( 'max_degree ' & kneighbor)

[imbajin]

TODO: figure out why kneighbor results is not stable (done)

[codecov]

Codecov Report

Merging #122 (71e213b) into master (6224c01) will not change coverage.
The diff coverage is 70.00%.

@@            Coverage Diff            @@
##             master     #122   +/-   ##
=========================================
  Coverage     76.95%   76.95%           
  Complexity      869      869           
=========================================
  Files           143      143           
  Lines          3810     3810           
  Branches        225      225           
=========================================
  Hits           2932     2932           
  Misses          712      712           
  Partials        166      166           

Impacted Files	Coverage Δ
...a/com/baidu/hugegraph/driver/TraverserManager.java	35.29% <0.00%> (ø)
.../baidu/hugegraph/structure/constant/Traverser.java	0.00% <ø> (ø)
...baidu/hugegraph/api/traverser/NeighborRankAPI.java	85.29% <100.00%> (ø)
...baidu/hugegraph/api/traverser/PersonalRankAPI.java	85.96% <100.00%> (ø)
...in/java/com/baidu/hugegraph/driver/HugeClient.java	83.01% <100.00%> (ø)
...egraph/structure/traverser/CrosspointsRequest.java	80.72% <100.00%> (ø)
...ph/structure/traverser/CustomizedPathsRequest.java	76.13% <100.00%> (ø)
.../baidu/hugegraph/structure/traverser/EdgeStep.java	93.75% <100.00%> (ø)
...structure/traverser/FusiformSimilarityRequest.java	87.67% <100.00%> (ø)

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