Show schema status in schema API

[javeme]

fix #800
Change-Id: I08b0e1c642915b739a152a54e84972e82843bc5a

[javeme]

should wait for task result being set after status is completed

[ERROR] Tests run: 669, Failures: 1, Errors: 0, Skipped: 62, Time elapsed: 193.75 s <<< FAILURE! - in com.baidu.hugegraph.core.CoreTestSuite
[ERROR] testGremlinJobWithFailure(com.baidu.hugegraph.core.TaskCoreTest)  Time elapsed: 0.322 s  <<< FAILURE!
java.lang.AssertionError: 
Expected: a string containing "Invalid bindings value 'null'"
     but: was null
	at com.baidu.hugegraph.core.TaskCoreTest.testGremlinJobWithFailure(TaskCoreTest.java:364)
Exception in thread "Thread-2" com.baidu.hugegraph.HugeException: Failed to shutdown
	at com.baidu.hugegraph.HugeFactory.shutdown(HugeFactory.java:126)
	at com.baidu.hugegraph.HugeFactory.lambda$static$0(HugeFactory.java:49)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.AssertionError: 1
	at com.baidu.hugegraph.task.TaskManager.shutdown(TaskManager.java:122)
	at com.baidu.hugegraph.HugeFactory.shutdown(HugeFactory.java:123)
	... 2 more

[codecov]

Codecov Report

Merging #1035 into master will increase coverage by 8.70%.
The diff coverage is 73.33%.

@@             Coverage Diff              @@
##             master    #1035      +/-   ##
============================================
+ Coverage     60.42%   69.12%   +8.70%     
- Complexity     4580     5422     +842     
============================================
  Files           329      329              
  Lines         26370    26377       +7     
  Branches       3757     3757              
============================================
+ Hits          15933    18234    +2301     
+ Misses         8710     6360    -2350     
- Partials       1727     1783      +56     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/api/schema/EdgeLabelAPI.java	56.94% <ø> (ø)	0.00 <0.00> (ø)
.../com/baidu/hugegraph/api/schema/IndexLabelAPI.java	71.79% <0.00%> (ø)	0.00 <0.00> (ø)
...com/baidu/hugegraph/api/schema/PropertyKeyAPI.java	46.66% <ø> (ø)	0.00 <0.00> (ø)
...com/baidu/hugegraph/api/schema/VertexLabelAPI.java	58.57% <ø> (ø)	0.00 <0.00> (ø)
...om/baidu/hugegraph/task/StandardTaskScheduler.java	85.26% <66.66%> (+1.57%)	67.00 <1.00> (+5.00)
...n/java/com/baidu/hugegraph/version/ApiVersion.java	75.00% <100.00%> (ø)	0.00 <0.00> (ø)
...m/baidu/hugegraph/io/GraphSONSchemaSerializer.java	84.41% <100.00%> (+84.41%)	10.00 <0.00> (+9.00)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.73% <0.00%> (+0.11%)	192.00% <0.00%> (+3.00%)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.11% <0.00%> (+0.22%)	297.00% <0.00%> (+15.00%)
...n/java/com/baidu/hugegraph/structure/HugeEdge.java	75.12% <0.00%> (+0.51%)	84.00% <0.00%> (+3.00%)
... and 125 more

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