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/kafka/client.go b/pkg/kafka/client.go
index bda7ed9..6289043 100755
--- a/pkg/kafka/client.go
+++ b/pkg/kafka/client.go
@@ -18,7 +18,7 @@
 import (
 	"time"
 
-	ca "github.com/opencord/voltha-protos/v2/go/inter_container"
+	ca "github.com/opencord/voltha-protos/v3/go/inter_container"
 )
 
 const (