support force delete task

[zhoney]

Change-Id: Ic533079dfc9be3e12a8f93fe719354501c159ada

[codecov]

Codecov Report

Merging #56 (c045f41) into gh-pre-release (5b86958) will decrease coverage by 0.08%.
The diff coverage is 88.88%.

@@                 Coverage Diff                  @@
##             gh-pre-release      #56      +/-   ##
====================================================
- Coverage             57.93%   57.85%   -0.09%     
- Complexity             6478     6483       +5     
====================================================
  Files                   429      430       +1     
  Lines                 35526    35595      +69     
  Branches               4911     4928      +17     
====================================================
+ Hits                  20581    20592      +11     
- Misses                12822    12877      +55     
- Partials               2123     2126       +3     

Impacted Files	Coverage Δ
...om/baidu/hugegraph/task/StandardTaskScheduler.java	76.45% <83.33%> (-0.13%)	⬇️
...main/java/com/baidu/hugegraph/api/job/TaskAPI.java	51.02% <100.00%> (ø)
...a/com/baidu/hugegraph/auth/HugeGraphAuthProxy.java	58.20% <100.00%> (ø)
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	100.00% <100.00%> (ø)
...in/java/com/baidu/hugegraph/core/GraphManager.java	32.33% <0.00%> (-3.47%)	⬇️
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	71.69% <0.00%> (-0.31%)	⬇️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	84.18% <0.00%> (-0.22%)	⬇️
...ava/com/baidu/hugegraph/api/profile/GraphsAPI.java	2.73% <0.00%> (-0.21%)	⬇️
...java/com/baidu/hugegraph/config/ServerOptions.java	100.00% <0.00%> (ø)
...a/com/baidu/hugegraph/backend/query/Condition.java	79.56% <0.00%> (+0.36%)	⬆️

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