Make vlan available as a variable about ipxe HOT 2 OPEN

Yes, this would be useful, and should be exposed via the netdevice settings mechanism in netdev_settings.c.

The only real question is what to call the variable. ${vlan} is potentially too generic a name and so likely to have been used in existing scripts. There is also the question of whether we need to expose the 12-bit VLAN tag number (as returned by vlan_tag()), the whole 16-bit VLAN tag control information number (as returned by vlan_tci()), or both. We could maybe have ${vlantag} and ${vlantci}?

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@mcb30 : Thanks for the very fast response :)

What about ${vlan-id} or ${vlan-tag} ? And I think only the tag is useful, don't see what additional info the tci will give.
But of course, it does not hurt to have ${vlan-tci} ... So if both is same effort, I would just do both :)

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