release-20.2:Backport!4027

Merged Andrey Vertiprahov requested to merge cherry-pick-ad2dcaaa into release-20.2

noc/noc#1163 Huawei.VRP.get_capabilities. Fix detect modules index for metrics.

See merge request !4027 (merged)

(cherry picked from commit ad2dcaaa)

c3d86d67 Huawei.VRP.get_capabilities. Fix detect modules index for metrics.

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