deal with the fact that the struct node_host ifa_pick_ip gets is not always

the result of an interface expansion. in this case ifa_pick_ip does an
address family check (that's actually a (wanted) side effect). Thus, we need
to spit out a meaningfull error message in case of a mismatch.
also adjust all the other error messages, they were also assuming that nh is
the result of an interface expansion.
after a looooong discussion on icb (dhartmei@, pb@, me) we agreed on the term
"translation address" for that.

okay dhartmei@

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