luci-mod-status,luci-mod-network: support oui to vendor resolving

luci-mod-status,luci-mod-network: support oui to vendor resolving

For easier definition of connected devices, this commit adds support
to identify them by vendor name.

Package `upf-neigh` is needed to lookup the vendor name in a hash table.
It implements a ubus-call `ubus call fingerprint fingerprint`:

```
root@<redacted> ~ # ubus call fingerprint fingerprint
{
        "7c:c2:55:XX:XX:XX": {
                "vendor": "Super Micro Computer, Inc."
        }
}
```

Fixes: #2065
Depends on: openwrt/packages#27257

Signed-off-by: Christian Korber <[email protected]>