fix: tinkerpop test does not close graph at the end

[javeme]

Change-Id: I1f2eb224d150438607b67a210ca90c328ab612f2

[codecov]

Codecov Report

Merging #453 into master will decrease coverage by 0.1%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             master     #453      +/-   ##
============================================
- Coverage     70.15%   70.04%   -0.11%     
+ Complexity     3281     3277       -4     
============================================
  Files           208      208              
  Lines         16082    16086       +4     
  Branches       2310     2310              
============================================
- Hits          11282    11268      -14     
- Misses         3547     3565      +18     
  Partials       1253     1253

Impacted Files	Coverage Δ	Complexity Δ
...e/src/main/java/com/baidu/hugegraph/HugeGraph.java	70.92% <71.42%> (-0.6%)	60 <0> (ø)
...ain/java/com/baidu/hugegraph/task/TaskManager.java	60.86% <0%> (-4.35%)	10% <0%> (-1%)
...raph/backend/store/rocksdb/RocksDBStdSessions.java	69.23% <0%> (-2.47%)	23% <0%> (-2%)
...u/hugegraph/backend/store/mysql/MysqlSessions.java	68.94% <0%> (-1.87%)	15% <0%> (-1%)
.../hugegraph/backend/store/rocksdb/RocksDBStore.java	56.7% <0%> (-1.54%)	40% <0%> (-1%)
...aidu/hugegraph/backend/store/mysql/MysqlStore.java	71.51% <0%> (-1.17%)	31% <0%> (ø)
...egraph/backend/store/cassandra/CassandraStore.java	62.44% <0%> (-0.82%)	37% <0%> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.84% <0%> (+0.47%)	145% <0%> (ø)	⬇️
...a/com/baidu/hugegraph/backend/query/Condition.java	62.96% <0%> (+0.52%)	20% <0%> (ø)	⬇️
... and 1 more

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