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/adapters/common/utils_test.go b/pkg/adapters/common/utils_test.go
index a93dd2f..d05162e 100644
--- a/pkg/adapters/common/utils_test.go
+++ b/pkg/adapters/common/utils_test.go
@@ -17,7 +17,7 @@
 
 import (
 	"context"
-	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
+	ic "github.com/opencord/voltha-protos/v4/go/inter_container"
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/grpc/codes"
 	"strconv"