VOL-3589 Update voltha go to support new version v4 of voltha protos

Change-Id: I32074b5c05b08f8ebd2205f8dc2af225bff465cc
diff --git a/db/model/common.go b/db/model/common.go
index e4d4d5a..4182403 100644
--- a/db/model/common.go
+++ b/db/model/common.go
@@ -18,7 +18,7 @@
 package model
 
 import (
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 var logger log.CLogger
diff --git a/db/model/proxy.go b/db/model/proxy.go
index 1f02544..a9e5241 100644
--- a/db/model/proxy.go
+++ b/db/model/proxy.go
@@ -24,8 +24,8 @@
 	"strings"
 
 	"github.com/gogo/protobuf/proto"
-	"github.com/opencord/voltha-lib-go/v3/pkg/db"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/db"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 // RequestTimestamp attribute used to store a timestamp in the context object
diff --git a/db/model/proxy_test.go b/db/model/proxy_test.go
index 550260f..f504ed7 100644
--- a/db/model/proxy_test.go
+++ b/db/model/proxy_test.go
@@ -25,11 +25,11 @@
 	"testing"
 
 	"github.com/google/uuid"
-	"github.com/opencord/voltha-lib-go/v3/pkg/db"
-	"github.com/opencord/voltha-lib-go/v3/pkg/db/kvstore"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-protos/v3/go/openflow_13"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/db"
+	"github.com/opencord/voltha-lib-go/v4/pkg/db/kvstore"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-protos/v4/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"github.com/stretchr/testify/assert"
 )