Dynamic update forwarding, except unauthorized forwarding.
Implemented as a XFR handler task, in a same way as NOTIFY queries for example. It also allows to change TSIG keys between hops, or no keys at all - this clear AD flag. Like: client <--key:A--> f1 <--key:B--> f2 <--NOKEY--> MASTER Forwarded queries also keep socket mode. To do: According to RFC2845, it should also forward queries with no known key intact to the next forwarded, this is not done yet. refs #1130
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