Use voltha-protos version 4.0.2
Bump major version of voltha-lib-go to 4.0.0 as this change results
in incompatible API version compared to previous version

Change-Id: I1def58361fb1d85f07d6948ebf1ffb7a92eb0d4c
diff --git a/pkg/kafka/sarama_client.go b/pkg/kafka/sarama_client.go
index 69450fa..1e4efae 100755
--- a/pkg/kafka/sarama_client.go
+++ b/pkg/kafka/sarama_client.go
@@ -29,8 +29,8 @@
 	"github.com/golang/protobuf/proto"
 	"github.com/golang/protobuf/ptypes"
 	"github.com/google/uuid"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	ic "github.com/opencord/voltha-protos/v4/go/inter_container"
 )
 
 // consumerChannels represents one or more consumers listening on a kafka topic.  Once a message is received on that