Shut down producer after test finished
Shut down producer after test finished

ah-/rdkafka-dotnet,treziac/confluent-kafka-dotnet,bjornicus/confluent-kafka-dotnet,bjornicus/confluent-kafka-dotnet,MaximGurschi/rdkafka-dotnet,treziac/confluent-kafka-dotnet,MrGlenThomas/confluent-kafka-dotnet,MrGlenThomas/confluent-kafka-dotnet