feat: add pam-pkcs11 configuration

Recommends libpam-pkcs11 package.
Add configuration for Safenet module (pam_pkcs11.conf)
Add UID mapper generator (pkcs11_generate_uids)
Configure certificates for pam_pkcs11 from postinst.

usr/sbin/pkcs11_generate_uids

@@ -0,0 +1,19 @@
+#!/bin/bash
+# 
+# Written by Michel Decima
+# Copyright 2021 Orange
+#
+# Generate uid mapping for pam_pkcs11 using /etc/passwd
+#
+
+(( EUID == 0 )) || { echo 2>&1 "Not root." ; exit 1 ; }
+
+mkdir -p /etc/pam_pkcs11
+# generate uid mapping for uppercase login ABCD1234 -> abcd1234
+getent -s files passwd \
+    | awk -F: '
+        /[a-z]{4}[0-9]{4}/ { 
+            printf "%s -> %s\n", toupper($1), $1 
+        }' \
+    >> /etc/pam_pkcs11/uid_mapping
+sort -u -o /etc/pam_pkcs11/uid_mapping /etc/pam_pkcs11/uid_mapping