Remove upstart support

Upstart has been discontinued for more than a decade, and no modern
distributions are using it anymore, so get rid of it.

scripts/clatd.networkmanager

@@ -29,8 +29,3 @@
 if which systemctl &> /dev/null; then
   systemctl --no-block restart clatd.service
 fi
-
-# upstart-based distros
-if test -x /sbin/initctl; then
-  /sbin/initctl restart clatd
-fi

scripts/clatd.upstart

@@ -1,16 +0,0 @@
-#
-# clatd service file for upstart
-#
-# Install it to:  /etc/init/clatd.conf
-# Start it with:  initctl start clatd
-# 
-# Written by Tore Anderson <tore@fud.no>
-#
-
-description "464XLAT CLAT daemon"
-author "Tore Anderson <tore@fud.no>"
-
-start on net-device-up
-stop on runlevel [!2345]
-
-exec /usr/sbin/clatd