Fixes #20966 - Added fast return to host power api
If the host does not support power actions (no BMC and the VMdoes not support it - return `unprocessable_entity` and exit witha message.
Fixes #20966 - Added fast return to host power api
If the host does not support power actions (no BMC and the VM
does not support it - return `unprocessable_entity` and exit with
a message.