Fixes #12034 - scope nics to validate uniqueness against

[ares]

No description provided.

[ares]

Hehe #12034 fixes #11034, I hope there won't be #13034 needed for this one :-)

[dLobatog]

Merged as 5863e06, thanks @ares!

[lzap]

Discovery creates all interfaces as Managed, I wonder if it's the time to create our own NIC type.

[ares]

@lzap I don't think that would be a good idea, think about how hard is converting Host::Discovered to Host::Managed during provisioning, you'd have to do the same with nics... I thought discovered interface were untouched since they are imported as unmanaged (managed: false). Unfortunately but luckilly it does not have anything to do with the class name.