Revert "remove <triggerhappy> since it went upstream"

since the upstream triggerhappy 0.1.5 not working in NanoNote
  use decide use the old one 0.1.3 with kyak's patch

This reverts commit 18ed9b5cdf.

utils/triggerhappy/files/triggerhappy.hotplug

@@ -0,0 +1,15 @@
+#!/bin/sh
+THD_SOCKET=/tmp/triggerhappy.socket
+[ -S "$THD_SOCKET" ] || exit
+
+case "$ACTION" in
+	add)
+		DEVICE="/dev/$DEVNAME"
+		[ -c "$DEVICE" ] || exit
+		# offer device to triggerhappy daemon
+		/usr/sbin/th-cmd --socket "$THD_SOCKET" --add "$DEVICE"
+	;;
+        remove)
+		# nothing to do
+	;;
+esac