2020-03-08: added cisco_asyncos_dns, cisco_asyncos_messageage, cisco_asyncos_resources
2021-03-21: rewrite cisco_asyncos_cpu/cisco_asyncos_mem for CMK 2.0
2024-04-18: fixed wrong queue states (ThX to alexander[dot]laengle[at]lgt[dot]com)
            fixed levels for queue full not working (ThX to alexander[dot]laengle[at]lgt[dot]com)
            fixed params for levels_upper in cisco_asyncos_mem (ThX to alexander[dot]laengle[at]lgt[dot]com)
            added host label cmk/os_family:AsyncOS
            added metrics for DNS, queue and bandwith
            added levels for DNS
            some refactoring