reservation-get and reservation-get-all do not return subnet-id

After implementing #2209 (closed) we have still 2 commands, that are inconsistent with others and do not return subnet-id when it is included in request:

Does NOT return `subnet-id` which is mandatory in the request:
reservation-get
reservation-get-all


Always returns `subnet-id`:
reservation-get-page
reservation-get-by-hostname
reservation-get-by-id

Edited Jun 30, 2022 by Francis Dupont

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