Add OpenLDAP LDIF file for Kerberos schema

Add an LDIF version of the Kerberos schema suitable for use with
OpenLDAP's cn=config.

https://github.com/krb5/krb5/commit/3a3ba541b5ba5f1a37cd0d4183edfba4faebc24a
Author: Greg Hudson <ghudson@mit.edu>
Commit: 3a3ba541b5ba5f1a37cd0d4183edfba4faebc24a
Branch: master
 .../kdb/ldap/libkdb_ldap/kerberos.openldap.ldif    |   68 ++++++++++++++++++++
 1 files changed, 68 insertions(+), 0 deletions(-)