[config] Added/updated vlan commands.#956

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rajkumar38 wants to merge 2 commits intosonic-net:masterfrom

rajkumar38:master

Commits on Jun 22, 2020

[config] Added/updated below vlan commands.
rajkumar38
committed

Commits on Sep 29, 2020

Fixed porstat rate and util issues
rajkumar38
committed