/etc/cfengine/debian-edu/cf.ldap2zone is in debian-edu-config 1.818+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 | #
# Configure ldap2zone to work with bind 
#
editfiles:
  debian.server.installation::
    # Configure ldap2zone for Debian Edu: 
    { /etc/default/ldap2zone
       LocateLineMatching '#BIND_DATA="/var/cache/bind"'
       AppendIfNoSuchLine 'BIND_DATA="/etc/bind"'
    }
 |