Add ability to configure PVID on VLAN page.

[TylerDurden-23]

The current state visualization does not work - but this was the state before and needs a additional PR to apply the phy_to_log transformation for the vlan interface state.

[logicog]

Testet it and it works! I like the concept, too!

I am just wondering whether it would be possible to also add a feature that allows to set an arbitrary PVID for the ports. Maybe have an input field in which the PVID is set to the VID by default when a VID is selected.

Would that make sense?

At present we cannot set arbitrary PVIDs for a port.

[TylerDurden-23]

@logicog You can enter a VLANID and only select ports for PVID - this would basically do it.
Also for totally arbitrary configs, PR #102 is likely the better approach.

I would argue, that the current default is what is needed in 90% of cases - configure the VLAN - and enable the PVID for all untagged ports. That is what is done with this PR.

[logicog]

That was not clear to my me. Maybe there could be a different message, something like this: "Use this VLAN as default for incoming traffic (PVID)"

[TylerDurden-23]

Maybe this as a compromise between being clear and to verbose and out of line with the other labels.