[Documentation] Add Routing Rules Update to Route Mgr Design

[cj-chung]

Add routing rules update design for use case scenario #6.

[xieus]

Look great.

Left a minor comment on workflow #4. Please take a look @cj-chung

[codecov-io]

Codecov Report

Merging #397 into master will decrease coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #397      +/-   ##
============================================
- Coverage     36.74%   36.52%   -0.22%     
- Complexity     1150     1156       +6     
============================================
  Files           448      452       +4     
  Lines         10759    10859     +100     
  Branches       1373     1392      +19     
============================================
+ Hits           3953     3966      +13     
- Misses         6268     6350      +82     
- Partials        538      543       +5     

Impacted Files	Coverage Δ	Complexity Δ
...wei/alcor/portmanager/processor/NetworkConfig.java	67.44% <0.00%> (-32.56%)	15.00% <0.00%> (+1.00%)	⬇️
...lcor/portmanager/processor/DataPlaneProcessor.java	65.30% <0.00%> (-10.64%)	31.00% <0.00%> (+2.00%)	⬇️
...portmanager/request/FetchRouterSubnetsRequest.java	72.22% <0.00%> (-6.35%)	5.00% <0.00%> (+1.00%)	⬇️
...rewei/alcor/portmanager/processor/PortContext.java	62.90% <0.00%> (-4.37%)	23.00% <0.00%> (+1.00%)	⬇️
...alcor/portmanager/util/RestParameterValidator.java	41.53% <0.00%> (-3.08%)	13.00% <0.00%> (-1.00%)
...r/route/service/Impl/NeutronRouterServiceImpl.java	51.20% <0.00%> (-2.47%)	26.00% <0.00%> (+1.00%)	⬇️
...ewei/alcor/subnet/controller/SubnetController.java	65.65% <0.00%> (-0.71%)	20.00% <0.00%> (ø%)
...cor/subnet/service/implement/SubnetServiceImp.java	1.47% <0.00%> (-0.11%)	1.00% <0.00%> (ø%)
.../futurewei/alcor/route/config/ConstantsConfig.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...cor/portmanager/util/NetworkConfigurationUtil.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
... and 9 more

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