Add missing newlines to deprecation warnings

Commit 8d8e68283b599e680f9fe45eff8af397e827bd6c omitted newlines in
two warning messages sent to stderr.  Add them now.

https://github.com/krb5/krb5/commit/274fee295d1429668b31c6ed898fc5d11a7e3589
Author: Greg Hudson <ghudson@mit.edu>
Commit: 274fee295d1429668b31c6ed898fc5d11a7e3589
Branch: master
 src/kdc/main.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)