Description of problem:

This is a sub-BZ of BZ #2091979.

"pam_namespace_helper" executed by "pam_namespace.service" doesn't read additional files in /etc/security/namespace.d, preventing administrators to effectively configure settings in additional files.

Version-Release number of selected component (if applicable):

pam-1.5.1-9.el9.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Enable poly-instantiation in creating a new file /etc/security/namespace.d/foo instead of editing /etc/security/namespace.conf
2. Start "pam_namespace.service" unit to create the temporary directories

Actual results:

Directories are not created because /etc/security/namespace.d/* is not read.

Expected results:

Directories created.