ddns-scripts: Update to Version 2.1.0-1 see description

- fixed postinst and prerm in Makefile
- implementation of provider specific update scripts into services and
services_ipv6 file.
	first Provider "no-ip.com"	- Thanks to DarkStarXxX for
request and testing
- finished uci/ddns wiki at http://wiki.openwrt.org/doc/uci/ddns
- rewritten retry management
- rewritten logging including following Issue 469
	https://github.com/openwrt/packages/issues/469
- stop running sections on hotplug ifdown event (like start on ifup)
- implement trap detection
	also kill "sleep" child processes
	SIGHUP to reload configuration (not really reloading, simply
starting a new process)
	/etc/init.d/ddns reload implemented
- code optimization
- new provider LoopiaDNS.se	Issue 494
	https://github.com/openwrt/packages/issues/494

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/ddns-scripts/files/etc/hotplug.d/iface/25-ddns

@@ -1,8 +1,14 @@
 #!/bin/sh
 
-if [ "$ACTION" = "ifup" ]; then
-	. /usr/lib/ddns/dynamic_dns_functions.sh
-	/etc/init.d/ddns enabled && start_daemon_for_all_ddns_sections "$INTERFACE"
-fi
-
-
+# there are other ACTIONs like ifupdate we don't need
+# so parse dynamic_dns_functions.sh only when needed
+case "$ACTION" in
+	ifup)
+		. /usr/lib/ddns/dynamic_dns_functions.sh
+		/etc/init.d/ddns enabled && start_daemon_for_all_ddns_sections "$INTERFACE"
+		;;
+	ifdown)
+		. /usr/lib/ddns/dynamic_dns_functions.sh
+		stop_daemon_for_all_ddns_sections "$INTERFACE"
+		;;
+esac