[BUG] VLAN access interfaces should have names/descriptions/neighbors

[ipspace]

The VLAN configuration module cleans the VLAN access interfaces, resulting in useless wiring and addressing reports. It should leave at least some minimal information on those interfaces.

Sample topology: vlan/01-vlan-bridge-single.yml

Sample addressing report:

| Node/Interface | IPv4 Address | IPv6 Address | Description |
|----------------|-------------:|-------------:|-------------|
| **s1** |  10.0.0.3/32 |  | Loopback |
| Ethernet1 |  |  |  |
| Ethernet2 |  |  |  |
| Vlan1000 |  |  | VLAN red (1000) -> [h1,h2] |

The "description" field on VLAN access link (Ethernet interfaces) should not be empty.