[Contract] Support Port Delete and Preliminary Support of Zeta GW

[er1cthe0ne]

The contract change provides support for port delete and adds preliminary Zeta support. The change includes:

1. added auxiliarygateway.proto to support generic gateways
2. made AuxGateway generic for all gateways and use "oneof" to store extra info on specific implementation (e.g. zeta).
3. added device_id and device_owner in proto.proto to support port delete scenario
4. added auxiliary_gateway at vpc.proto
5. fix compiler error in DPM because vpc tunnel ID is changed to uint

[codecov-io]

Codecov Report

Merging #467 (f89226d) into master (97a7c17) will increase coverage by 0.03%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #467      +/-   ##
============================================
+ Coverage     36.53%   36.56%   +0.03%     
- Complexity     1157     1159       +2     
============================================
  Files           452      452              
  Lines         10859    10861       +2     
  Branches       1392     1393       +1     
============================================
+ Hits           3967     3971       +4     
+ Misses         6350     6349       -1     
+ Partials        542      541       -1     

Impacted Files	Coverage Δ	Complexity Δ
...r/route/service/Impl/NeutronRouterServiceImpl.java	51.49% <0.00%> (+0.29%)	27.00% <0.00%> (+1.00%)
...com/futurewei/alcor/macmanager/utils/MacUtils.java	65.21% <0.00%> (+8.69%)	8.00% <0.00%> (+1.00%)

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[xieus]

@chenpiaoping This is the PR change we discussed in the open-source meeting today.

[chenpiaoping]

@chenpiaoping This is the PR change we discussed in the open-source meeting today.

ok