VOL-1643 Update voltha-lib-go to use voltha-protos v3.0.0

and bump up the version to 3.0.0. voltha-protos is modified to be
compatible with the java language proto compilation. It's a major
change and a major version change has been made.

Change-Id: Ifb93430567ddf96aaa0fbf6e5853aad9e1070f6f
diff --git a/pkg/mocks/kafka_client.go b/pkg/mocks/kafka_client.go
index 381c093..51bd532 100644
--- a/pkg/mocks/kafka_client.go
+++ b/pkg/mocks/kafka_client.go
@@ -17,12 +17,13 @@
 
 import (
 	"fmt"
-	"github.com/opencord/voltha-lib-go/v2/pkg/kafka"
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
-	ic "github.com/opencord/voltha-protos/v2/go/inter_container"
+	"sync"
+
+	"github.com/opencord/voltha-lib-go/v3/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
-	"sync"
 )
 
 type KafkaClient struct {