release-19.3:Backport!2676

Merged Andrey Vertiprahov requested to merge cherry-pick-f694e6c1 into release-19.3

Raisecom.RCIOS add get_inventory.

See merge request !2676 (merged)

(cherry picked from commit f694e6c1)

aeb87f66 Raisecom.RCIOS add get_inventory. d283f271 Fix black.

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