Enforce SMBLoris attack protection in default Samba configuration
    
    See https://access.redhat.com/security/vulnerabilities/smbloris for
    details.
    
    There is no recommended value but for IPA DC we can limit with 1000
    concurrent connections from unrelated clients.
    
    Related: https://pagure.io/freeipa/issue/6951
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>