Allow kprop over more types of NATs

Do not send an r-address in messages from kprop, so that kpropd will
not check it against the receiver address.  This change allows kprop
to work when a NAT changes the destination address.  (Commit
775e496aac2650343ec20826b1ba7f6306a12f3c allows kprop to work when a
NAT changes the source address.)  Reported by Jorj Bauer.

https://github.com/krb5/krb5/commit/92cc557796e72b49f2bd50f6b705dc3b8acf357e
Author: Greg Hudson <ghudson@mit.edu>
Commit: 92cc557796e72b49f2bd50f6b705dc3b8acf357e
Branch: master
 src/kprop/kprop.c |   10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)