ipatests: interactive install prompts for netbios name
    
    The interactive server installation now prompts for netbios
    name confirmation.
    Add expected prompt and send response to the installer.
    
    Related: https://pagure.io/freeipa/issue/8995
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>