Remove deprecated fields from Vpc, VpcConfig and VpcStatus

[ianderson-nvidia]

Remove deprecated fields - Vpc, VpcConfig, and VpcStatus from protobuf definitions, ensuring both core and rest components are updated as well.

See #928 for original gRPC changes

[thossain-nv]

@hwadekar-nv this should only update the communication between REST and gRPC layer and not change the end user API contract.