[Hotfix] Fix Subnet Deletion and Update Issues

[kevin-zhonghao]

Hotfix for subnet deletion and update:

1. Add update gateway port in PM step in Add/Remove interface to router API.
2. Fix web class display error in swagger ui.
3. Fix subnet deletion and update issue.
4. revert rbac configuration. https://github.com/futurewei-cloud/alcor/pull/502/files

[codecov-io]

Codecov Report

Merging #507 (efa6e35) into master (977ac09) will decrease coverage by 0.00%.
The diff coverage is 23.52%.

@@             Coverage Diff              @@
##             master     #507      +/-   ##
============================================
- Coverage     35.72%   35.72%   -0.01%     
  Complexity     1163     1163              
============================================
  Files           467      468       +1     
  Lines         11305    11318      +13     
  Branches       1453     1456       +3     
============================================
+ Hits           4039     4043       +4     
- Misses         6715     6723       +8     
- Partials        551      552       +1     

Impacted Files	Coverage Δ	Complexity Δ
...lcor/route/service/Impl/RouterToPMServiceImpl.java	6.66% <0.00%> (-1.03%)	1.00 <0.00> (ø)
...lcor/subnet/exception/CanNotUpdateGatewayPort.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...cor/subnet/service/implement/SubnetServiceImp.java	1.11% <ø> (ø)	1.00 <0.00> (ø)
...ewei/alcor/subnet/controller/SubnetController.java	57.30% <20.00%> (-0.97%)	16.00 <0.00> (ø)
...r/route/service/Impl/NeutronRouterServiceImpl.java	40.30% <100.00%> (+0.25%)	28.00 <0.00> (ø)
...alcor/elasticipmanager/dao/ElasticIpAllocator.java	63.81% <0.00%> (+0.27%)	48.00% <0.00%> (ø%)

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[cj-chung]

LGTM
@xieus please merge the code, so that we can verify it in our cluster.

[cj-chung]

LGTM