Posting commands with tenant ID to single-tenant BC

[dmytro-kashcheiev]

Spine 1.7.1

If you mistakenly create a command via ActorRequestFactory with tenantId that targets single-tenant BC.

And post this command directly to CommandService via post(Command request, StreamObserver<Ack> responseObserver).

Response observer receives onCompleted but the command is not delivered and leads to internal CommandErrored that is not even logged.

[armiol]

Let's check this upon receiving the command. And fail fast in case of the tenancy mismatch.