ifplugd: Log interface state changes.

Change-Id: I6f32d7f2c0f92aba2336d0471cbb1e8c7a7e66ae
diff --git a/package/ifplugd/ifplugd.action b/package/ifplugd/ifplugd.action
index df5f281..19ac49d 100755
--- a/package/ifplugd/ifplugd.action
+++ b/package/ifplugd/ifplugd.action
@@ -9,6 +9,8 @@
 
 CONMAN_STATUS_DIR=/tmp/conman/interfaces
 
+echo "ifplugd: $iface is $action"
+
 case "$action" in
   up)
     if [ "$iface" = pon0 ]; then