[ddns-scripts] Update to Version 2.0.1-1

Sorry GitHub web interface only supports single commits that will be summarized into one pull request.

NEW in this version:
- IPv6 support
- force communication to IPv4 or IPv6 only
- DNS server support
- using BIND host if installed
- DNS requests via TCP (there are ISP modems caching UDP requests whatever DNS you use)
- Proxy server support
- log file support
- support to run once

There is also a new LuCI Application availible contributed via Luci mailing list (supporting both versions of ddns-scripts)
Many thanks to Bill who did a log of testing for me.

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>