Checkmk Werk 13642: REST API: Fix representation of locked_by host attribute

ID: 13642 Title: REST API: Fix representation of locked_by host attribute Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 The locked_by host attribute was represented as string by the REST API while it is actually a more complex data structure. The scheme is now representing the data structure in the correct way.