Check_MK Werk 7338: Dropped ancient "no_discovery_possible" from check API

ID: 7338 Title: Dropped ancient "no_discovery_possible" from check API Component: Core & setup Level: 1 Class: Bug fix Version: 1.6.0i1 The function no_discovery_possible was provided by the check API in the early days were the check_info was declared as 3-element tuple. Since the checks are registered as dictionaries this function is not needed anymore. In case you get an issue with this after an update, you will have to migrate your checks to the current check_info syntax.