dns: Reintroduce include_empty_AAAA_if_no_ipv6 option, needed for diagnosis
dns: Reintroduce include_empty_AAAA_if_no_ipv6 option, needed for diagnosis

YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost