None type IP allocation fails for allowed delegates

[Levovar]

Which basically only concerns SR-IOV: it works with IPVLAN, it already wasn't allowed for MACVLAN because it would not work at all, and all the static delegates handle their IPAM on their own; they are not integrated to DANM IPAM.
(Hmm, now that I think about it, they actually could be. How awesome that would be :) Anyway, other thread)

The problem is that when we want no IPs on the interface, we create an "ipam" section with only "type: fakeipam" attribute set.
However, that prompts the CNI to call the CNI IPAM package, at which point we will expect some IPs to be allocated.
Based on upstream:
https://github.com/intel/sriov-cni/blob/master/cmd/sriov/main.go#L77
the correct behaviour is to forego adding the whole IPAM section