release-20.2:Backport!4140

Merged Andrey Vertiprahov requested to merge cherry-pick-1af34d37 into release-20.2

#1328 (closed) Add vlan_ids to unit ConfDB syntax.

See merge request !4140 (merged)

(cherry picked from commit 1af34d37)

17cb74c6 Add vlan_ids to unit ConfDB syntax.

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