fw: use Signal in FaceTable

refs #2272

Change-Id: I831963b8311c257178ad0da16d62e48b476bfee3
diff --git a/daemon/mgmt/face-manager.hpp b/daemon/mgmt/face-manager.hpp
index d4d979b..75477bf 100644
--- a/daemon/mgmt/face-manager.hpp
+++ b/daemon/mgmt/face-manager.hpp
@@ -173,6 +173,8 @@
 
 private:
   FaceTable& m_faceTable;
+  signal::ScopedConnection m_faceAddConn;
+  signal::ScopedConnection m_faceRemoveConn;
   FaceStatusPublisher m_faceStatusPublisher;
   ChannelStatusPublisher m_channelStatusPublisher;
   NotificationStream<AppFace> m_notificationStream;