NewFakeProtocol returns a FakeProtocol with configured response and expected error.

NewGrpcConnection creates a gRPC connection.

FakeProtocol is a fake for testing, implements CAProtocol interface.

GrpcConnection implements CAProtocol talking to CA via gRPC.

CAGrpcClient is for implementing the GRPC client to talk to CA.

CAProtocol is the interface for talking to CA.