refactor rcS template to 2 templates for squeeze and wheezy because there are new obsolete field in wheezy in this config file
add a class debian::pam to handle config file /etc/pam.d/common-session and manage the Debian bug #583958 about umask
reformat login_def manifest and set umask param as a string
add a debconf class and a debconf::set_selection define to handle preseed of packages
fix: don't need session pam_ck_connector.so on servers