fix checkstyle for core/EntityManager

[seagle-yuan]

relate #1837

fix checkstyle issue

src/main/java/com/baidu/hugegraph/backend/cache/OffheapCache.java
src/main/java/com/baidu/hugegraph/backend/id/IdGenerator.java
src/main/java/com/baidu/hugegraph/task/TaskCallable.java
src/main/java/com/baidu/hugegraph/backend/cache/OffheapCache.java
src/main/java/com/baidu/hugegraph/backend/id/IdGenerator.java
src/main/java/com/baidu/hugegraph/task/TaskCallable.java
src/main/java/com/baidu/hugegraph/auth/EntityManager

[codecov]

Codecov Report

Merging #1841 (0a94183) into master (85b01b2) will increase coverage by 6.28%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1841      +/-   ##
============================================
+ Coverage     64.45%   70.74%   +6.28%     
- Complexity      914      982      +68     
============================================
  Files           447      447              
  Lines         38040    38040              
  Branches       5389     5389              
============================================
+ Hits          24520    26911    +2391     
+ Misses        11000     8496    -2504     
- Partials       2520     2633     +113     

Impacted Files	Coverage Δ
...ugegraph/backend/cache/CachedGraphTransaction.java	85.48% <ø> (ø)
...va/com/baidu/hugegraph/backend/id/IdGenerator.java	77.20% <ø> (+10.29%)	⬆️
...n/java/com/baidu/hugegraph/auth/EntityManager.java	93.42% <100.00%> (ø)
.../com/baidu/hugegraph/auth/RelationshipManager.java	80.76% <100.00%> (ø)
...in/java/com/baidu/hugegraph/auth/SchemaDefine.java	76.10% <100.00%> (ø)
...om/baidu/hugegraph/backend/cache/OffheapCache.java	79.88% <100.00%> (+17.24%)	⬆️
...in/java/com/baidu/hugegraph/task/TaskCallable.java	55.88% <100.00%> (ø)
...m/baidu/hugegraph/io/GraphSONSchemaSerializer.java	84.61% <0.00%> (ø)
...hugegraph/backend/store/raft/rpc/RaftRequests.java	27.85% <0.00%> (+0.06%)	⬆️
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	66.95% <0.00%> (+0.35%)	⬆️
... and 88 more

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