fix tasks are sometimes submitted twice

[javeme]

related #1075

[codecov]

Codecov Report

Merging #1130 into master will decrease coverage by 0.58%.
The diff coverage is 28.57%.

@@             Coverage Diff              @@
##             master    #1130      +/-   ##
============================================
- Coverage     65.88%   65.30%   -0.59%     
+ Complexity     5653     5602      -51     
============================================
  Files           354      354              
  Lines         28836    28840       +4     
  Branches       4062     4064       +2     
============================================
- Hits          19000    18833     -167     
- Misses         7958     8139     +181     
+ Partials       1878     1868      -10     

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/baidu/hugegraph/api/job/ComputerAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...idu/hugegraph/backend/store/raft/RaftRequests.java	0.00% <ø> (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% <ø> (ø)	0.00 <0.00> (ø)
...baidu/hugegraph/job/computer/AbstractComputer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...om/baidu/hugegraph/task/StandardTaskScheduler.java	77.55% <25.00%> (-0.59%)	86.00 <0.00> (ø)
...va/com/baidu/hugegraph/task/ServerInfoManager.java	71.59% <50.00%> (-3.27%)	51.00 <1.00> (-1.00)
...gegraph/backend/store/rocksdb/RocksDBFeatures.java	10.00% <0.00%> (-75.00%)	2.00% <0.00%> (-15.00%)
.../hugegraph/backend/store/rocksdb/RocksDBTable.java	16.15% <0.00%> (-56.16%)	10.00% <0.00%> (-27.00%)
...om/baidu/hugegraph/backend/store/BackendEntry.java	31.42% <0.00%> (-40.00%)	1.00% <0.00%> (ø%)
... and 7 more

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