Post bellow follows up two Fedora 20 VMs setup described in :-
http://kashyapc.fedorapeople.org/virt/openstack/Two-node-Havana-setup.txt
Both cases have been tested above – default and non-default libvirt’s networks
In meantime I believe that using libvirt’s networks for creating Controller and Compute nodes as F20 VMs is not important. Configs allow metadata to be sent from Controller to Compute on real physical boxes. Just one Ethernet Controller per box should be required in case of using GRE tunnelling for RDO Havana on Fedora 20 manual setup.