Don't create DS SSCA and self-signed cert
    
    Instruct lib389 to not create its self-signed CA and temporary
    self-signed certificate. FreeIPA uses local connections and Unix socket
    for bootstrapping.
    
    Fixes: https://pagure.io/freeipa/issue/8502
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>