ddns-scripts: Ver.2.6.0 - support hostip and uclient-fetch

- add support for "hostip" to get_registered_ip() as alternative to "Bind host" package https://dev.openwrt.org/ticket/20893#comment:5
- allow to send updates using compiled-in certificate file/path of curl/wget #2242 #2243 #2245
- add support for uclient-fetch / libustream-ssl.so
- remove /128 prefix-filter in get_local_ip() via interface #2268
- add dyndns.org to services_ipv6 https://forum.openwrt.org/viewtopic.php?id=62103
- readd duckdns.org to services #2251 (lost somewhere in data heaven)
- add zzzz.io service #2302
- updated tld_names.dat

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

net/ddns-scripts/files/dynamic_dns_updater.sh

@@ -1,21 +1,12 @@
 #!/bin/sh
 # /usr/lib/ddns/dynamic_dns_updater.sh
 #
-# Original written by Eric Paul Bishop, January 2008
 #.Distributed under the terms of the GNU General Public License (GPL) version 2.0
+# Original written by Eric Paul Bishop, January 2008
 # (Loosely) based on the script on the one posted by exobyte in the forums here:
 # http://forum.openwrt.org/viewtopic.php?id=14040
-#
-# extended and partial rewritten in August 2014 by
-#.Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
-# to support:
-# - IPv6 DDNS services
-# - DNS Server to retrieve registered IP including TCP transport (Ticket 7820)
-# - Proxy Server to send out updates
-# - force_interval=0 to run once (Luci Ticket 538)
-# - the usage of BIND's host command instead of BusyBox's nslookup if installed
-# - extended Verbose Mode and log file support for better error detection
-# - wait for interface to fully come up, before the first update is done
+# extended and partial rewritten
+#.2014-2016 Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
 #
 # variables in small chars are read from /etc/config/ddns
 # variables in big chars are defined inside these scripts as global vars