face: downgrade "Creating transport" log message to DEBUG

FaceTable already logs at INFO level whenever a new face is added.

Change-Id: Id2905c8b6d42df8bfc4c43cc12d432d9ce180aae
diff --git a/daemon/face/multicast-ethernet-transport.cpp b/daemon/face/multicast-ethernet-transport.cpp
index f0fa5ce..80f13ea 100644
--- a/daemon/face/multicast-ethernet-transport.cpp
+++ b/daemon/face/multicast-ethernet-transport.cpp
@@ -63,7 +63,7 @@
   this->setLinkType(linkType);
   this->setMtu(localEndpoint.getMtu());
 
-  NFD_LOG_FACE_INFO("Creating transport");
+  NFD_LOG_FACE_DEBUG("Creating transport");
 
   char filter[110];
   // note #1: we cannot use std::snprintf because it's not available