Create VLAN interface before DHCPing:

[jacobweinstock]

Description

This enables creating VLAN interfaces based on the vlan_id= value in /proc/cmdline. No VLAN interface will be created if vlan_id= does not have a value.

Why is this needed

This enables trunk vlan support across the Tink stack. https://github.com/tinkerbell/proposals/blob/main/proposals/0030/README.md

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• [ ] updated the documentation and/or roadmap (if required)
• [ ] added unit or e2e tests
• [ ] provided instructions on how to upgrade