[Network Config Manager] Demo Code

[xieus]

This PR provides a schelton of the new Network Configuration Manager, including gRPC stream API for GS programming. Note that data persistence and south bound programming will be included shortly in next PR.

[codecov-io]

Codecov Report

Merging #562 (cabbe3d) into master (eb5a0c4) will decrease coverage by 0.35%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #562      +/-   ##
============================================
- Coverage     34.36%   34.01%   -0.36%     
- Complexity     1235     1241       +6     
============================================
  Files           501      508       +7     
  Lines         12398    12549     +151     
  Branches       1567     1574       +7     
============================================
+ Hits           4261     4268       +7     
- Misses         7558     7706     +148     
+ Partials        579      575       -4     

Impacted Files	Coverage Δ	Complexity Δ
...configmanager/NetworkConfigManagerApplication.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...configmanager/client/gRPC/GoalStateClientImpl.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...turewei/alcor/netwconfigmanager/config/Config.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...figmanager/controller/NetworkConfigController.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../alcor/netwconfigmanager/entity/HostGoalState.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...anager/server/grpc/GoalStateProvisionerServer.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...twconfigmanager/util/NetworkConfigManagerUtil.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ewei/alcor/portmanager/PortManagerApplication.java	33.33% <ø> (ø)	1.00 <0.00> (ø)
... and 9 more

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