Add OpenVPN with MPTCP upstream support

openvpn/files/etc/hotplug.d/openvpn/01-user

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+[ -e "/etc/openvpn.user" ] && {
+	env -i ACTION="$ACTION" INSTANCE="$INSTANCE" \
+		/bin/sh \
+		/etc/openvpn.user \
+		$*
+}
+
+# Wrap user defined scripts on up/down events
+case "$ACTION" in
+	up) command=$user_up ;;
+	down) command=$user_down ;;
+	*) command= ;;
+esac
+
+if [ -n "$command" ]; then
+	shift
+	exec /bin/sh -c "$command $*"
+fi
+
+exit 0

openvpn/files/etc/openvpn.user

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This file is interpreted as shell script.
+# Put your custom openvpn action here, they will
+# be executed with each opevnp event.
+#
+# $ACTION
+#      <down>    down action is generated after the TUN/TAP device is closed
+#      <up>      up action is generated after the TUN/TAP device is opened
+# $INSTANCE  Name of the openvpn instance which went up or down
+