/etc/cfengine/debian-edu/cf.dhcpserver 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.
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  debian.server::
	/etc/dhcp/dhcpd.conf ->! /etc/dhcp/dhcpd-debian-edu.conf
		nofile=force
  debian::
	/etc/dhcp/dhclient.conf ->! /etc/dhcp/dhclient-debian-edu.conf
		nofile=force
editfiles:
  debian.server::
        # The file /etc/default/isc-dhcp-server controls what interface the
        # dhcp server will listen on.  We will have one monster dhcpd.conf file
        # that contains definitions for both the eth0 and eth1 interfaces and
        # control which is active by manipulating this
        # /etc/default/isc-dhcp-server
        #
        # Make sure this is synced with cf.ltsp (LTSP server)
	# Enable DHCP server on eth0
        { /etc/default/isc-dhcp-server
              BeginGroupIfNoMatch 'INTERFACES="eth0"'
                  LocateLineMatching 'INTERFACES=""'
                  ReplaceLineWith 'INTERFACES="eth0"'
              EndGroup
        }
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