Checkmk Werk 11610: Bulk import: Improve validation of imported attributes

ID: 11610 Title: Bulk import: Improve validation of imported attributes Component: Multisite Level: 1 Class: Bug fix Version: 2.0.0i2 When setting e.g. tag attributes during the bulk import, the values from the CSV file were not validated using the normal validation logic of the host attribute. This made it possible to import attributed with invalid values, leading to errors in different situations. The import now applies the same validation logic as the host edit forms and prevent importing data which does not pass this validation.