VOL-2138 Use v2 import paths for voltha-lib-go

Change-Id: I853dcce79c4defbe3140f3893651a2f50d63e053
diff --git a/rw_core/graph/device_graph.go b/rw_core/graph/device_graph.go
index 5bfaf96..aa08a6c 100644
--- a/rw_core/graph/device_graph.go
+++ b/rw_core/graph/device_graph.go
@@ -20,7 +20,7 @@
 	"errors"
 	"fmt"
 	"github.com/gyuho/goraph"
-	"github.com/opencord/voltha-lib-go/pkg/log"
+	"github.com/opencord/voltha-lib-go/v2/pkg/log"
 	"github.com/opencord/voltha-protos/go/voltha"
 	"strconv"
 	"strings"