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/common.go b/pkg/mocks/common.go
index d6d4062..839ac3e 100644
--- a/pkg/mocks/common.go
+++ b/pkg/mocks/common.go
@@ -16,7 +16,7 @@
 package mocks
 
 import (
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
 )
 
 const (