The import string for voltha-lib-go library needs to change from v5
to v6 after a major version upgrade of the voltha-lib-go library.

Change-Id: If443376b150e0f4bb49f50cb2c8cf8c132b7244b
diff --git a/pkg/db/backend_test.go b/pkg/db/backend_test.go
index 7f1d878..90f38ab 100644
--- a/pkg/db/backend_test.go
+++ b/pkg/db/backend_test.go
@@ -23,7 +23,7 @@
 	"testing"
 	"time"
 
-	mocks "github.com/opencord/voltha-lib-go/v5/pkg/mocks/etcd"
+	mocks "github.com/opencord/voltha-lib-go/v6/pkg/mocks/etcd"
 	"github.com/phayes/freeport"
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/grpc/codes"