[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

[xieus]

Oneof is the good choice that fits our requirement.

One reminder that it could potentially cause memory crash in C++ code if not used properly, for example, delete one field and then try to set the deleted field. So please watch out for the implementation detail especially on oneof parsing and handling.

[xieus]

LGTM