Bug#1061560: Need to remove /etc/dhcp/dhclient-exit-hooks.d/fetch-ldap-cert on upgrade

[Guido Berhoerster <guido@berhoerster.name>]

Package: debian-edu-config
Version: 2.12.43

The dhclient hook /etc/dhcp/dhclient-exit-hooks.d/fetch-ldap-cert has been
renamed to/etc/dhcp/dhclient-exit-hooks.d/fetch-rootca-cert in
https://salsa.debian.org/debian-edu/debian-edu-config/-/commit/912fa538970efd7175481779a5bde71f6d14d530
On package upgrade the old hook fetch-ldap-cert will be left behind and
lead to errors because the init script it tries to start no longer exists.

The old hook should probably be removed by a maintainer script.

-- 
Guido Berhoerster