Don't treat local krbtgt principal as referral

If we look up a principal and in the KDB and get back the local TGS
principal, the KDC should treat this as an alias, not a referral, and
should therefore issue a ticket for the requested principal rather the
canonical name.

https://github.com/krb5/krb5/commit/22f00f6b8233fa281e5aad854789bd14abdda91b
Author: Greg Hudson <ghudson@mit.edu>
Commit: 22f00f6b8233fa281e5aad854789bd14abdda91b
Branch: master
 src/kdc/do_tgs_req.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)