mgmt: Add UP and DOWN kinds to FaceEventNotification

refs #3794

Change-Id: I3676841c004e0861c45c2cb9e0669f2091b5b372
diff --git a/src/mgmt/nfd/face-event-notification.cpp b/src/mgmt/nfd/face-event-notification.cpp
index 3422ee8..a65c7ba 100644
--- a/src/mgmt/nfd/face-event-notification.cpp
+++ b/src/mgmt/nfd/face-event-notification.cpp
@@ -179,6 +179,12 @@
     case FACE_EVENT_DESTROYED:
       os << "Kind: destroyed, ";
       break;
+    case FACE_EVENT_UP:
+      os << "Kind: up, ";
+      break;
+    case FACE_EVENT_DOWN:
+      os << "Kind: down, ";
+      break;
     }
 
   os << "FaceID: " << notification.getFaceId() << ", "