[subport] Allow to add Subport without vlan argument #8
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What I did
Allow to add Subport without vlan argument
Why I did it
The alias of subport already contains the VLAN ID information. If no vlan be specified in the input argument, it would use the vlan in the alias as the vlan id
How I verified it
Use swssconfig to generate config to make sure the subport be created
Details if related