refactor UserManager to AuthManager

[javeme]

Change-Id: Icd421eac05da2cfeb629974d282f9a6cd9c523f5

[codecov]

Codecov Report

Merging #1363 (06d3720) into master (964daf1) will increase coverage by 0.01%.
The diff coverage is 4.27%.

@@             Coverage Diff              @@
##             master    #1363      +/-   ##
============================================
+ Coverage     62.38%   62.39%   +0.01%     
+ Complexity     5827     5817      -10     
============================================
  Files           385      385              
  Lines         31940    31922      -18     
  Branches       4458     4451       -7     
============================================
- Hits          19925    19917       -8     
+ Misses         9995     9984      -11     
- Partials       2020     2021       +1     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/baidu/hugegraph/api/auth/AccessAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...n/java/com/baidu/hugegraph/api/auth/BelongAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...in/java/com/baidu/hugegraph/api/auth/GroupAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...n/java/com/baidu/hugegraph/api/auth/TargetAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ain/java/com/baidu/hugegraph/api/auth/UserAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../com/baidu/hugegraph/auth/ConfigAuthenticator.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...va/com/baidu/hugegraph/auth/HugeAuthenticator.java	20.32% <ø> (ø)	0.00 <0.00> (ø)
...com/baidu/hugegraph/auth/HugeFactoryAuthProxy.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/com/baidu/hugegraph/auth/HugeGraphAuthProxy.java	3.98% <0.00%> (ø)	0.00 <0.00> (ø)
...om/baidu/hugegraph/auth/StandardAuthenticator.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 15 more

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[javeme]

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project hugegraph-core: Compilation failure
[ERROR] /home/travis/build/hugegraph/hugegraph/hugegraph-core/src/main/java/com/baidu/hugegraph/auth/SchemaDefine.java:[245,39] cannot find symbol
[ERROR]   symbol:   class Namifiable
[ERROR]   location: class com.baidu.hugegraph.auth.SchemaDefine

this error will be fixed at #1376