allow users to create missing appnamespaces and private namespaces

[nobodyiam]

Fixes #1469 #1484

[codecov-io]

Codecov Report

Merging #1707 into master will decrease coverage by 0.18%.
The diff coverage is 4.25%.

@@             Coverage Diff              @@
##             master    #1707      +/-   ##
============================================
- Coverage     48.71%   48.53%   -0.19%     
  Complexity     1911     1911              
============================================
  Files           392      392              
  Lines         11576    11617      +41     
  Branches       1214     1219       +5     
============================================
- Hits           5639     5638       -1     
- Misses         5490     5531      +41     
- Partials        447      448       +1

Impacted Files	Coverage Δ	Complexity Δ
.../apollo/portal/controller/NamespaceController.java	2.24% <0%> (-1.04%)	2 <0> (ø)
...ork/apollo/portal/service/AppNamespaceService.java	71.25% <0%> (-0.91%)	20 <0> (ø)
...mework/apollo/biz/service/AppNamespaceService.java	27.77% <0%> (ø)	7 <0> (ø)	⬇️
...p/framework/apollo/portal/api/AdminServiceAPI.java	12.73% <0%> (-0.42%)	1 <0> (ø)
...mework/apollo/portal/service/NamespaceService.java	69.29% <0%> (-0.55%)	26 <0> (ø)
...dminservice/controller/AppNamespaceController.java	26.08% <18.18%> (-9.21%)	2 <0> (ø)
.../apollo/internals/RemoteConfigLongPollService.java	76.68% <0%> (-1.23%)	27% <0%> (-1%)
...amework/apollo/openapi/util/ConsumerAuditUtil.java	83.33% <0%> (+2.77%)	7% <0%> (+1%)	⬆️

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[coveralls]

Coverage decreased (-0.2%) to 52.389% when pulling e4572e1 on nobodyiam:makeup-private-namespaces into 9655981 on ctripcorp:master.