fix neq condition matched index

[javeme]

Change-Id: I01f2e5ca92611f5516fe4a178a88e308c9dbc671

[javeme]

travis cassandra:

[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running com.baidu.hugegraph.api.ApiTestSuite
[ERROR] Tests run: 43, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 20.91 s <<< FAILURE! - in com.baidu.hugegraph.api.ApiTestSuite
[ERROR] testList(com.baidu.hugegraph.api.IndexLabelApiTest)  Time elapsed: 0.418 s  <<< FAILURE!
java.lang.AssertionError: Response with status 400 and content {"exception":"class com.baidu.hugegraph.exception.ExistedException","message":"The index label 'personByAge' has existed","cause":""} expected:<202> but was:<400>
	at com.baidu.hugegraph.api.IndexLabelApiTest.testList(IndexLabelApiTest.java:134)
[INFO] 
[INFO] Results:
[INFO] 
[ERROR] Failures: 
[ERROR]   IndexLabelApiTest.testList:134->BaseApiTest.assertResponseStatus:435 Response with status 400 and content {"exception":"class com.baidu.hugegraph.exception.ExistedException","message":"The index label 'personByAge' has existed","cause":""} expected:<202> but was:<400>
[INFO] 
[ERROR] Tests run: 43, Failures: 1, Errors: 0, Skipped: 0

[codecov]

Codecov Report

Merging #1007 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1007      +/-   ##
============================================
- Coverage     69.35%   69.34%   -0.01%     
- Complexity     5275     5281       +6     
============================================
  Files           325      325              
  Lines         25870    25881      +11     
  Branches       3647     3649       +2     
============================================
+ Hits          17941    17948       +7     
- Misses         6207     6211       +4     
  Partials       1722     1722              

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	80.48% <100.00%> (+0.40%)	31.00 <0.00> (ø)
.../baidu/hugegraph/backend/query/ConditionQuery.java	86.20% <100.00%> (+0.30%)	101.00 <3.00> (+3.00)
...gegraph/backend/store/memory/InMemoryDBTables.java	78.76% <100.00%> (ø)	0.00 <0.00> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.85% <100.00%> (+0.02%)	192.00 <20.00> (+2.00)
...om/baidu/hugegraph/api/filter/ExceptionFilter.java	66.66% <0.00%> (-4.31%)	0.00% <0.00%> (ø%)
...va/com/baidu/hugegraph/backend/id/IdGenerator.java	81.51% <0.00%> (-0.85%)	20.00% <0.00%> (ø%)
...du/hugegraph/traversal/optimize/TraversalUtil.java	61.69% <0.00%> (+0.25%)	109.00% <0.00%> (+1.00%)

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