Checkmk Werk 13445: Allow single character names

ID: 13445 Title: Allow single character names Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 Several endpoints (contact_group_config, password, service_group_config, host_group_config, and time_period) used a field which required at least two characters, although it was possible to create a one character name via the UI.