Commissioning fails if NIC gets different PCI address

[Björn Tillenius]

This is with MAAS 3.0.0~beta3 (9853-g.28bad2fcb)

I added some PCI devices to a machine in MAAS, and as
a result, an existing NIC got another PCI address.

This makes commissioning fail:

  https://paste.ubuntu.com/p/7ZbWd6mMDS/

We sort of handle the case where PCI devices move, but we
never look at what the validation error is. So in this case
we try to remove the wrong device before creating a new one.

[Björn Tillenius (bjornt)]

I attached the old commissioning data before the PCI devices were changed, and the new, where the processing fails.

The device that causes problem is "RTL8125 2.5GbE Controller"