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

Change-Id: I9de8accd128f23ef9d1a363a3b2038e5076826f9
diff --git a/adaptercore/olt_state_transitions.go b/adaptercore/olt_state_transitions.go
index d5edb63..feb07d7 100644
--- a/adaptercore/olt_state_transitions.go
+++ b/adaptercore/olt_state_transitions.go
@@ -21,7 +21,7 @@
 	"reflect"
 	"runtime"
 
-	"github.com/opencord/voltha-lib-go/pkg/log"
+	"github.com/opencord/voltha-lib-go/v2/pkg/log"
 )
 
 // DeviceState OLT Device state