release-20.2:Backport!4105

Merged Andrey Vertiprahov requested to merge cherry-pick-f4743b9a into release-20.2

inv.models.platform: Fix to_json sorting

See merge request !4105 (merged)

(cherry picked from commit f4743b9a)

f6ff20b7 inv.models.platform: Fix to_json sorting

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