[WIP] configure vlan sub interfaces#151

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pperiyasamy wants to merge 7 commits intok8snetworkplumbingwg:mainfrom

Nordix:vlan-sub-interface

Commits on Apr 27, 2021

Commits on Apr 28, 2021

Commits on Apr 29, 2021

fix unit test errors
pperiyasamy
committed

Commits on May 6, 2021

correction in vlan sub interface creation and ip assignment
pperiyasamy
committed