The correct name of this post is supposed to be "Nova and Neutron workflow && CLI for HAProxy/Keepalived 3 Node Controller RDO Liberty in an appropriate amount of detail". It follows up http://lxer.com/module/newswire/view/222164/index.html . All environment has been built via Nova and Neutron CLI ( no Horizon involvement ). Neutron work-flow on Controller is described including OVS flow rules on external brigge created by flat external network provider and eth0 external interface as VLAN OVS port of bridge br-eth0.
Complete text may be seen here