Ticket 49041 - nss won't start if sql db type set
    
    Bug Description:   We only check for key3.db and cert8.db. However, newer NSS in
    fedora creates key4.db and cert9.db. When you make certs they go here, and if
    you restart DS, it touches the blank files key3.db and cert8.db, so then you
    have a broken NSS database.
    
    Fix Description:  Check for key3.db, key4.db, cert8.db and cert9.db.
    
    https://fedorahosted.org/389/ticket/49041
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)