Support Red Hat 8 and above 'authselect' format for files in /etc/pam.d and /etc/authselect

[bschonec]

The files in /etc/pam.d/ are managed a bit differently depending on whether the underlying authentication scripts are based on 'authconfig' (RHEL7 and older) or 'authselect' (RHEL8 and newer).

For authconfig (RHEL7 and older) some of the files are:

/etc/pam.d/fingerprint-auth-ac
/etc/pam.d/password-auth-ac
/etc/pam.d/system-auth-ac

with symbolic links from eg:

/etc/pam.d/fingerprint-auth -> fingerprint-auth-ac
/etc/pam.d/password-auth -> /etc/pam.d/password-auth-ac
/etc/pam.d/system-auth -> /etc/pam.d/system-auth-ac

RHEL8 and newer uses authselect which has symlinks in /etc/pam.d to their appropriate files in /etc/authselect/ eg:

/etc/pam.d/fingerprint-auth -> /etc/authselect/fingerprint-auth
/etc/pam.d/password-auth -> /etc/authselect/password-auth
/etc/pam.d/system-auth -> /etc/authselect/system-auth

Should this module manage the files in /etc/authselect/ and then create symlinks in /etc/pam.d or should this module continue to manage the files in /etc/pam.d (which technically, is incorrect). If the latter, should the symlinks from password-auth -> password-auth-ac (and others) be removed to maintain some level of correctness when using authselect?

'authselect' complains when there are no symlinks from /etc/pam.d to /etc/authselect. If this module manages the files in /etc/authselect, then 'authselect' is less cranky.