doc: openwrt: remove 'up' and 'down' options

The way these options work is incompatible with USE_PROCD. Use on_up and
on_down instead, which are handled by fastd itself.

doc/examples/openwrt/fastd.config

@@ -87,12 +87,6 @@ config fastd sample_config
 	# Possible values: 1, 0, early, force (see fastd documentation for a description of the values)
 #	option drop_capabilities '1'
 
-	# Command to configure IP addresses etc. after the tunnel interface is up; $1 will be the interface name (optional)
-#	option up ''
-
-	# Command to execute before the tunnel interface is set down; $1 will be the interface name (optional)
-#	option down ''
-
 	# Commands executed by fastd ($INTERFACE can be used for the interface name; optional)
 	# All except on_pre_up and on_post_down may also be used in peer groups
 #	option on_pre_up ''

doc/examples/openwrt/fastd.init

@@ -318,12 +318,6 @@ start_instance() {
 		error "$s: startup failed"
 		return 1
 	fi
-
-	# Used for `up` script only - may be unset in multi-interface configs
-	config_get interface "$s" interface
-
-	config_get up "$s" up
-	[ -n "$up" ] && sh -c "$up" - "$interface"
 }
 
 stop_instance() {
@@ -333,12 +327,6 @@ stop_instance() {
 
 	SERVICE_PID_FILE="/var/run/fastd.$s.pid"
 
-	# Used for `down` script only - may be unset in multi-interface configs
-	config_get interface "$s" interface
-
-	config_get down "$s" down
-	[ -n "$down" ] && sh -c "$down" - "$interface"
-
 	service_stop "$FASTD_COMMAND"
 
 	rm -rf "$TMP_FASTD/fastd.$s"