fix TraversalStrategyProxy() compile error on java 11

[javeme]

compile error on java 11:
Cannot infer type arguments for new TraversalStrategyProxy<>(strategy)

Change-Id: I6a31cb24d4f37cc6af9ae9769a986593301ea1ff

[codecov]

Codecov Report

Merging #1982 (b5cd781) into master (99d4481) will increase coverage by 4.67%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master    #1982      +/-   ##
============================================
+ Coverage     65.86%   70.54%   +4.67%     
  Complexity      724      724              
============================================
  Files           454      454              
  Lines         39053    39054       +1     
  Branches       5556     5556              
============================================
+ Hits          25723    27549    +1826     
+ Misses        10794     8809    -1985     
- Partials       2536     2696     +160     

Impacted Files	Coverage Δ
...a/com/baidu/hugegraph/auth/HugeGraphAuthProxy.java	57.57% <83.33%> (+0.77%)	⬆️
...va/com/baidu/hugegraph/util/collection/IntSet.java	73.72% <0.00%> (-1.28%)	⬇️
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	76.36% <0.00%> (-0.61%)	⬇️
...va/com/baidu/hugegraph/util/collection/IntMap.java	72.40% <0.00%> (-0.40%)	⬇️
...u/hugegraph/backend/store/hbase/HbaseSessions.java	61.09% <0.00%> (ø)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.14% <0.00%> (+0.20%)	⬆️
.../baidu/hugegraph/backend/query/ConditionQuery.java	85.88% <0.00%> (+0.24%)	⬆️
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.22% <0.00%> (+0.30%)	⬆️
...java/com/baidu/hugegraph/structure/HugeVertex.java	79.50% <0.00%> (+0.35%)	⬆️
...gegraph/backend/cache/CachedSchemaTransaction.java	90.65% <0.00%> (+0.46%)	⬆️
... and 61 more

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