change http return code of property create&update

[zhoney]

Change-Id: I0463c6326863a6c882408737b3dfe2e12adabeaa

[codecov]

Codecov Report

Merging #1584 (cec43d6) into master (0dc7b27) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1584      +/-   ##
============================================
+ Coverage     63.26%   63.28%   +0.02%     
- Complexity     6703     6705       +2     
============================================
  Files           418      418              
  Lines         34449    34449              
  Branches       4765     4765              
============================================
+ Hits          21793    21800       +7     
+ Misses        10407    10402       -5     
+ Partials       2249     2247       -2     

Impacted Files	Coverage Δ
...com/baidu/hugegraph/api/schema/PropertyKeyAPI.java	43.47% <ø> (ø)
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.30% <0.00%> (+0.30%)	⬆️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	84.18% <0.00%> (+0.53%)	⬆️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	71.34% <0.00%> (+0.56%)	⬆️

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