Checkmk Werk 12122: API: modification of time period endpoint to support built-in time period

ID: 12122 Title: API: modification of time period endpoint to support built-in time period Component: Core & setup Level: 1 Class: New feature Version: 2.1.0i1 This change introduces the possibility to get information about the default built-in time period "24X7" through the show timeperiod endpoint.