properly purge remaining config files on purge

debian/control

@@ -11,7 +11,7 @@ Vcs-Browser: https://github.com/ovh/debian-cis/
 Package: cis-hardening
 Architecture: all
 Depends: ${misc:Depends}, bc, patch
-Description: Suite of configurable scripts to audit or harden a Debian Wheezy or Jessie.
- Modular  Debian  7/8  security hardening scripts based on cisecurity.org
+Description: Suite of configurable scripts to audit or harden a Debian.
+ Modular Debian security hardening scripts based on cisecurity.org
  ⟨cisecurity.org⟩ recommendations. We use it at OVH ⟨https://www.ovh.com⟩ to
  harden our PCI-DSS infrastructure.

debian/postrm

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+case "$1" in
+
+    purge)
+        rm -f /opt/cis-hardening/etc/conf.d/*.cfg
+        ;;
+
+    remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
+        # nothing to do
+        ;;
+
+    *)
+        echo "$0 called with unknown argument \`$1\`'" >&2
+        exit 1
+    ;;
+esac