Add domain_realm mappings to the athena krb5.ini

These seem to be the only bits from the krb5.ini shipped with older
versions of KfW that remain useful.

Signed-off-by: Kevin Wasserman <kevin.wasserman@painless-security.com>

[kaduk@mit.edu: add motivation to commit message]

(cherry picked from commit f468fc02ff3b32c12f0f41662a05a9bf07680b87)

https://github.com/krb5/krb5/commit/a4ea60b159867acb51ad002f7b82defe6469256c
Author: Kevin Wasserman <kevin.wasserman@painless-security.com>
Committer: Tom Yu <tlyu@mit.edu>
Commit: a4ea60b159867acb51ad002f7b82defe6469256c
Branch: krb5-1.10
 src/windows/installer/wix/athena/krb5.ini |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)