Use voltha-protos version 4.0.2
Bump major version of voltha-lib-go to 4.0.0 as this change results
in incompatible API version compared to previous version

Change-Id: I1def58361fb1d85f07d6948ebf1ffb7a92eb0d4c
diff --git a/pkg/config/logcontroller.go b/pkg/config/logcontroller.go
index f83e383..8187edc 100644
--- a/pkg/config/logcontroller.go
+++ b/pkg/config/logcontroller.go
@@ -26,7 +26,7 @@
 	"crypto/md5"
 	"encoding/json"
 	"errors"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 	"os"
 	"sort"
 	"strings"