fix checkstyle: delete unused import

[seagle-yuan]

delete unused import

hugegraph-dist/src/main/java/com/baidu/hugegraph/cmd/ConfDumper.java
hugegraph-dist/src/main/java/com/baidu/hugegraph/cmd/StoreDumper.java

[codecov]

Codecov Report

Merging #1874 (e388360) into master (9769406) will increase coverage by 4.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1874      +/-   ##
============================================
+ Coverage     66.92%   70.97%   +4.05%     
  Complexity      980      980              
============================================
  Files           447      447              
  Lines         38096    38096              
  Branches       5404     5404              
============================================
+ Hits          25494    27037    +1543     
+ Misses        10086     8413    -1673     
- Partials       2516     2646     +130     

Impacted Files	Coverage Δ
.../main/java/com/baidu/hugegraph/cmd/ConfDumper.java	0.00% <ø> (ø)
...main/java/com/baidu/hugegraph/cmd/StoreDumper.java	0.00% <ø> (ø)
...om/baidu/hugegraph/api/filter/ExceptionFilter.java	56.73% <0.00%> (-3.85%)	⬇️
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	75.92% <0.00%> (-0.62%)	⬇️
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.14% <0.00%> (+0.20%)	⬆️
...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%)	⬆️
.../baidu/hugegraph/backend/tx/SchemaTransaction.java	89.31% <0.00%> (+0.38%)	⬆️
...gegraph/backend/cache/CachedSchemaTransaction.java	91.30% <0.00%> (+0.48%)	⬆️
...om/baidu/hugegraph/task/StandardTaskScheduler.java	76.15% <0.00%> (+0.48%)	⬆️
... and 49 more

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