[Contract] Add default_routing_table to Router Configuration

[er1cthe0ne]

This minor contract change includes:

1. added default_routing_table to router configuration - to support the current subnet manager and router design.
2. change from AuxGateway_type to aux_gateway_type in AuxGateway message - proto3 changes upper case field name to lower case during .proto file compile, so the change is to make this field explicitly to lower case and makes it pretty.

[xieus]

LGTM.

[codecov-io]

Codecov Report

Merging #479 (aeeb7df) into master (456d800) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #479      +/-   ##
============================================
- Coverage     36.59%   36.59%   -0.01%     
  Complexity     1162     1162              
============================================
  Files           453      453              
  Lines         10869    10869              
  Branches       1393     1393              
============================================
- Hits           3978     3977       -1     
- Misses         6349     6350       +1     
  Partials        542      542              

Impacted Files	Coverage Δ	Complexity Δ
...alcor/elasticipmanager/dao/ElasticIpAllocator.java	63.53% <0.00%> (-0.28%)	48.00% <0.00%> (ø%)

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