release-19.4:Backport!3116

Merged Andrey Vertiprahov requested to merge cherry-pick-9ae7a1f6 into release-19.4

noc/noc#1163 Huawei.VRP.get_inventory. Add S8504 slot count.

See merge request !3116 (merged)

(cherry picked from commit 9ae7a1f6)

21e72037 Huawei.VRP.get_inventory. Add S8504 slot count.

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