9978bff PAM: Don't send PAM_SYSTEM_INFO message if module unset

Authored and Committed by sgallagh 7 years ago
    PAM: Don't send PAM_SYSTEM_INFO message if module unset
    
    We now have a session module that is only available for the IPA
    provider. We should not be logging noisily that other providers
    do not have the session provider configured.
    
    https://fedorahosted.org/sssd/ticket/1211