Port access.conf to use new pam_access_assemble role

We have a new pam_access_assemble Ansible role that lets us better build PAM access.conf files from fragments that other modules can provide.

We need to adjust access.conf related tasks and handlers in this role to work with pam_access_assemble.

This requires adding access fragments for the following:

• proxmox cluster nodes ... and perhaps more.

This logic can be borrowed from the access.conf.fragments templates in the new ssh_user_access Ansible role.