fix checkstyle : CypherApiTest

[JackyYangPassion]

• delete unused import
• fix static variable name
• fix the length of a single line of code is less than 100

hugegraph-test/src/main/java/com/baidu/hugegraph/api/CypherApiTest.java

[codecov]

Codecov Report

Merging #1877 (210488e) into master (cd09304) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1877      +/-   ##
============================================
- Coverage     66.89%   66.88%   -0.02%     
  Complexity      728      728              
============================================
  Files           449      449              
  Lines         38116    38116              
  Branches       5404     5404              
============================================
- Hits          25498    25493       -5     
- Misses        10105    10108       +3     
- Partials       2513     2515       +2     

Impacted Files	Coverage Δ
...graph/backend/store/cassandra/CassandraTables.java	89.78% <0.00%> (-0.73%)	⬇️
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	75.92% <0.00%> (-0.62%)	⬇️
...va/com/baidu/hugegraph/util/collection/IntMap.java	72.40% <0.00%> (-0.40%)	⬇️

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