Add mechanism to reload domain related services (#1710)

package/gluon-core/files/lib/gluon/reload.d/500-core

+#!/bin/sh
+/etc/init.d/network restart

package/gluon-core/files/usr/bin/gluon-reload

+#!/bin/sh
+
+cd "/lib/gluon/reload.d" || exit 1
+
+err=0
+
+for script in *; do
+	echo "Reloading: ${script}"
+	./"$script" || err=1
+done
+
+if [ $err -eq 1 ]; then
+	echo 'One or more daemons failed to reload.' >&2
+	exit 1
+fi
+
+exit 0

package/gluon-mesh-vpn-fastd/files/lib/gluon/reload.d/200-mesh-vpn-fastd-stop

+#!/bin/sh
+/etc/init.d/fastd stop

package/gluon-mesh-vpn-fastd/files/lib/gluon/reload.d/800-mesh-vpn-fastd-start

+#!/bin/sh
+/etc/init.d/fastd start

package/gluon-mesh-vpn-tunneldigger/files/lib/gluon/reload.d/200-mesh-vpn-tunneldigger-stop

+#!/bin/sh
+/etc/init.d/tunneldigger stop

package/gluon-mesh-vpn-tunneldigger/files/lib/gluon/reload.d/800-mesh-vpn-tunneldigger-start

+#!/bin/sh
+/etc/init.d/tunneldigger start

package/gluon-respondd/files/lib/gluon/reload.d/100-respondd-stop

+#!/bin/sh
+/etc/init.d/gluon-respondd stop

package/gluon-respondd/files/lib/gluon/reload.d/900-respondd-start

+#!/bin/sh
+/etc/init.d/gluon-respondd start