Howto: Create a new network profile that doesn't have the MAC spoofing filter 
included. In my case I used one without any filters, you may want to be more 
careful.

Background:
I had tried the nested approach with the default settings and found that the 
hosted-engine setup worked just find to the point where it was running as a 
nested VM on the install node, but that it failed to tie in the other gluster 
nodes or to communicate to the outside: There was something wrong with the 
network, but no obivous failures.

I tried using other, simpler "client hypervisors" (it's all KVM anyway) 
VirtualBox and 'native' KVM and the symptoms were the same: The VMs ran just 
fine, but the network didn't connect.

And then I remembered that obviously a Hypervisor need to override the MAC for 
each client VM if you want full network access and I had come across 
"no-mac-spoofing" often enough it somehow stayed on my mind... and finally it 
clicked.

Anyhow, validing full functionality now and the main interest in this is the 
ability to do a full simulation/testing of oVirt 4.3->4.4 upgrades on 3-node 
HCI setups, which I'd rather not do on the live physical system.

Of course, it's also quite cool!
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