allow public namespaces created with no org prefix

[nobodyiam]

Purpose

To allow the user create public namespaces with no org prefix

Brief changes

1. Added a append org prefix checkbox in the namespace creation page
2. Will check public namespace name global uniqueness before creation
   • global uniqueness means the name is not used as any public namespace as well as any private namespace

Effect

1. when append org prefix checkbox is checked (default behavior)

2. when append org prefix checkbox is unchecked

[codecov-io]

Codecov Report

Merging #1476 into master will increase coverage by 0.12%.
The diff coverage is 85%.

@@             Coverage Diff              @@
##             master    #1476      +/-   ##
============================================
+ Coverage      48.4%   48.53%   +0.12%     
- Complexity     1801     1809       +8     
============================================
  Files           379      379              
  Lines         10930    10947      +17     
  Branches       1121     1125       +4     
============================================
+ Hits           5291     5313      +22     
+ Misses         5253     5245       -8     
- Partials        386      389       +3

Impacted Files	Coverage Δ	Complexity Δ
.../apollo/portal/controller/NamespaceController.java	3.77% <0%> (ø)	2 <0> (ø)	⬇️
...ork/apollo/portal/service/AppNamespaceService.java	71.42% <89.47%> (+4.76%)	19 <5> (+7)	⬆️
...lo/configservice/util/InstanceConfigAuditUtil.java	70.17% <0%> (-0.88%)	13% <0%> (-1%)
...ervice/service/ReleaseMessageServiceWithCache.java	86.9% <0%> (ø)	25% <0%> (ø)	⬇️
...work/apollo/biz/message/DatabaseMessageSender.java	66.66% <0%> (+16.66%)	8% <0%> (+2%)	⬆️

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[coveralls]

Coverage increased (+0.07%) to 52.2% when pulling b949afa on nobodyiam:allow-public-namespace-with-no-org-prefix into 9e3aec5 on ctripcorp:master.

[chickenlj]

Awesome, I think this can make the config model more flexible. Sometimes, people may need global namespace.