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

Component	REST API
Title	REST API: Fix representation of locked_by host attribute
Date	Mar 30, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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.

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