when doing a "secure nbns" wack response and check with owner for a

when doing a "secure nbns" wack response and check with owner for a
multihomed registration we were sending the packet to the wrong host!
We sent it to the person trying to register rather than to the person
who currently holds the name. That means we were not secure and we
could allow two people to register the same name.

Jeremy, you may wish to merge this change into 2.0.X
(This used to be commit 94ca1d1250d12918311a402cc689050ba1d06e24)