Fix unexpected task status

[javeme]

related: #1738

[codecov]

Codecov Report

Merging #1767 (13c2567) into master (5cdf770) will increase coverage by 7.52%.
The diff coverage is 82.60%.

@@             Coverage Diff              @@
##             master    #1767      +/-   ##
============================================
+ Coverage     63.26%   70.79%   +7.52%     
- Complexity      684      970     +286     
============================================
  Files           443      443              
  Lines         37738    37748      +10     
  Branches       5381     5383       +2     
============================================
+ Hits          23875    26722    +2847     
+ Misses        11247     8305    -2942     
- Partials       2616     2721     +105     

Impacted Files	Coverage Δ
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.30% <ø> (+0.61%)	⬆️
...ain/java/com/baidu/hugegraph/task/TaskManager.java	74.82% <ø> (+6.47%)	⬆️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	78.49% <80.00%> (+5.46%)	⬆️
...main/java/com/baidu/hugegraph/api/job/TaskAPI.java	51.02% <100.00%> (ø)
...om/baidu/hugegraph/task/StandardTaskScheduler.java	76.21% <100.00%> (+1.09%)	⬆️
...du/hugegraph/traversal/optimize/TraversalUtil.java	62.60% <0.00%> (+0.21%)	⬆️
.../com/baidu/hugegraph/auth/StandardAuthManager.java	92.81% <0.00%> (+0.32%)	⬆️
...idu/hugegraph/schema/builder/EdgeLabelBuilder.java	83.62% <0.00%> (+0.34%)	⬆️
...u/hugegraph/schema/builder/VertexLabelBuilder.java	85.44% <0.00%> (+0.37%)	⬆️
.../java/com/baidu/hugegraph/backend/query/Query.java	86.11% <0.00%> (+0.39%)	⬆️
... and 127 more

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[javeme]

ci error of shared storage:

[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running com.baidu.hugegraph.api.ApiTestSuite
Error:  Tests run: 84, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 88.882 s <<< FAILURE! - in com.baidu.hugegraph.api.ApiTestSuite
Error:  testClearAndInit(com.baidu.hugegraph.api.GremlinApiTest)  Time elapsed: 46.267 s  <<< FAILURE!
java.lang.AssertionError: Response with status 400 and content {"exception":"java.lang.IllegalArgumentException","message":"Already existed master 'server-1' in current cluster","cause":"[java.lang.IllegalArgumentException]"} expected:<200> but was:<400>
	at com.baidu.hugegraph.api.GremlinApiTest.testClearAndInit(GremlinApiTest.java:124)