In the case of a cluster that reuses an existing /home filesystem on CephFS with an external LDAP, it could be desirable to support oddjob-mkhomedir to create home directories on first login

This requires:

• Ensuring that yum pkg oddjob-mkhomedir is installed (it usually is, but just in case)
• Adding session optional pam_oddjob_mkhomedir.so debug umask=0077 to /etc/pam.d/password-auth and /etc/pam.d/system-auth
• Ensuring that the oddjobd service is running
• Possibly notifying dbus and sssd

This could be added as a boolean $mkhomedir in https://github.com/ComputeCanada/puppet-magic_castle/blob/main/site/profile/manifests/sssd.pp#L1