2019-10-21: added WATO plugin
2019-10-29: added lastcange to infotext
            changed service name from "VTP status" to "VTP"
2020-07-24: fixed vtpdomain and vtpversion infotext output, minor typos
2021-07-31: rewritten for CMK 2.0
2022-11-30: WATO: fixed CheckParameterRulespecWithoutItem (from CheckParameterRulespecWithItem)