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/Makefile

@@ -1,8 +1,8 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ddns-scripts
-PKG_VERSION:=2.0.1
-PKG_RELEASE:=9
+PKG_VERSION:=2.1.0
+PKG_RELEASE:=1
 PKG_LICENSE:=GPL-2.0
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
@@ -62,7 +62,10 @@ endef
 define Package/ddns-scripts/postinst
 	#!/bin/sh
 	# if run within buildroot exit
-	[ -n "${IPKG_INSTROOT}" ] && exit 0
+	[ -n "$${IPKG_INSTROOT}" ] && exit 0
+
+	# remove old sed script file
+	[ -f /usr/lib/ddns/url_escape.sed ] && rm -f /usr/lib/ddns/url_escape.sed
 
 	# add new section "ddns" "global" if not exists
 	uci -q get ddns.global > /dev/null || uci -q set ddns.global='ddns'
@@ -79,7 +82,7 @@ endef
 define Package/ddns-scripts/prerm
 	#!/bin/sh
 	# if run within buildroot exit
-	[ -n "${IPKG_INSTROOT}" ] && exit 0
+	[ -n "$${IPKG_INSTROOT}" ] && exit 0
 
 	# stop running scripts
 	/etc/init.d/ddns disable