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/grpc/common_test.go b/pkg/grpc/common_test.go
index ff4980a..b7151f7 100644
--- a/pkg/grpc/common_test.go
+++ b/pkg/grpc/common_test.go
@@ -16,7 +16,7 @@
 package grpc
 
 import (
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
 )
 
 const (
diff --git a/pkg/grpc/server.go b/pkg/grpc/server.go
index 7796b83..33c9b76 100644
--- a/pkg/grpc/server.go
+++ b/pkg/grpc/server.go
@@ -18,7 +18,7 @@
 import (
 	"context"
 	"fmt"
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"