face: add logging to LpReliability

refs #5080

Change-Id: I2dce3f9d933273cb65603c7cd2177c5d142f4487
diff --git a/daemon/face/generic-link-service.cpp b/daemon/face/generic-link-service.cpp
index b3b7d96..1fecdb6 100644
--- a/daemon/face/generic-link-service.cpp
+++ b/daemon/face/generic-link-service.cpp
@@ -67,6 +67,7 @@
 {
   // No need to request Acks to attach to this packet from LpReliability, as they are already
   // attached in sendLpPacket
+  NFD_LOG_FACE_TRACE("IDLE packet requested");
   this->sendLpPacket({}, endpointId);
 }