Add support for GSS-API DDNS
For request: http://www.abclinuxu.cz/zpravicky/knot-dns-1.5.0/diskuse#19 or for Bind 9 details see: http://jpmens.net/2012/06/29/dynamic-dns-updates-using-gss-tsig-and-kerberos/
For request: http://www.abclinuxu.cz/zpravicky/knot-dns-1.5.0/diskuse#19 or for Bind 9 details see: http://jpmens.net/2012/06/29/dynamic-dns-updates-using-gss-tsig-and-kerberos/