[wip] Correct scanning of non-PCI network devices

[pirat89]

Non-PCI network devices (present usually on IBM Z architecture) does not have ID_VENDOR_ID attribute and also there is nothing we could put into Interface.pci_info about them.

For such devices, set empty string for Interface.vendor field and None value for pci_info.

The Interface model has been updated, allowing None value for pci_info field.

jira: RHEL-22371

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