fix style for raft module

[javeme]

Change-Id: I36cf1e0093fb34837e5c5f46ace91c38eae10a74

[codecov]

Codecov Report

Merging #1423 (0a6eb42) into master (3c9dbca) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #1423   +/-   ##
=========================================
  Coverage     62.22%   62.23%           
+ Complexity     5855     5853    -2     
=========================================
  Files           381      381           
  Lines         32109    32096   -13     
  Branches       4492     4491    -1     
=========================================
- Hits          19981    19976    -5     
+ Misses        10091    10082    -9     
- Partials       2037     2038    +1     

Impacted Files	Coverage Δ	Complexity Δ
...hugegraph/backend/store/raft/RaftBackendStore.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...h/backend/store/raft/RaftBackendStoreProvider.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...aidu/hugegraph/backend/store/raft/RaftClosure.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...graph/backend/store/raft/RaftGroupManagerImpl.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...m/baidu/hugegraph/backend/store/raft/RaftNode.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...baidu/hugegraph/backend/store/raft/RaftResult.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ugegraph/backend/store/raft/RaftSharedContext.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...hugegraph/backend/store/raft/RaftStoreClosure.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...idu/hugegraph/backend/store/raft/StoreCommand.java	55.17% <0.00%> (ø)	7.00 <1.00> (ø)
.../hugegraph/backend/store/raft/StoreSerializer.java	58.73% <0.00%> (ø)	6.00 <0.00> (ø)
... and 7 more

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[Linary]

remove it. Don't write misleading annotation to shield warnings