fix auth bugs

[javeme]

• support task details permission
• allowed system schema(like user/task/var) accessed by anyone
• remove GREMLIN_JOB res type and add task EXECUTE
• improve variables exception cause
• fix variables init-schema race condition

Change-Id: I05a5d3ea16a434ad53a6ffa760bdf4bf25ce1089

[codecov]

Codecov Report

Merging #1002 into master will decrease coverage by 0.18%.
The diff coverage is 6.01%.

@@             Coverage Diff              @@
##             master    #1002      +/-   ##
============================================
- Coverage     69.72%   69.53%   -0.19%     
- Complexity     5126     5274     +148     
============================================
  Files           320      324       +4     
  Lines         24853    25795     +942     
  Branches       3466     3635     +169     
============================================
+ Hits          17329    17937     +608     
- Misses         5861     6136     +275     
- Partials       1663     1722      +59     

Impacted Files	Coverage Δ	Complexity Δ
...va/com/baidu/hugegraph/auth/HugeAuthenticator.java	14.50% <0.00%> (-0.55%)	0.00 <0.00> (ø)
...com/baidu/hugegraph/auth/HugeFactoryAuthProxy.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/com/baidu/hugegraph/auth/ResourceObject.java	75.00% <0.00%> (-4.32%)	7.00 <0.00> (ø)
...in/java/com/baidu/hugegraph/auth/SchemaDefine.java	79.00% <0.00%> (-0.80%)	10.00 <0.00> (ø)
.../com/baidu/hugegraph/auth/StandardUserManager.java	93.95% <ø> (ø)	59.00 <0.00> (ø)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.28% <ø> (-0.13%)	295.00 <0.00> (+12.00)	⬇️
...egraph/traversal/optimize/HugeScriptTraversal.java	72.09% <0.00%> (-1.72%)	5.00 <0.00> (ø)
...a/com/baidu/hugegraph/variables/HugeVariables.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/com/baidu/hugegraph/auth/HugeGraphAuthProxy.java	4.33% <1.00%> (-0.45%)	0.00 <0.00> (ø)
...in/java/com/baidu/hugegraph/auth/HugeResource.java	79.73% <28.57%> (-2.70%)	43.00 <0.00> (ø)
... and 72 more

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