/usr/share/debian-lan-config/fai/config/debconf/KERBEROS_KDC is in debian-lan-config 0.19+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | krb5-admin-server krb5-admin-server/kadmind boolean true
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