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Unfortunatelly it's too hard to analyze  mistakes been done in your setup.
I can provide a link based on updated  setup for Two  Fedora 20 VMs running on non-default libvirt subnet     suggested by  Kashyap Chamarthy in November 2013. Setup down here is for Two  Node Fedora 20 physical boxes with  native Havana packages installed.  I have in meantime several  Two Node Clusters been built as descibed bellow running on daily basis in QA environment for about 2.5  months. So, I am quite sure that provided HowTo is correct. Have to mention that there is no any answer file, every setup has been done manually following ,in general, original Kashyap's instructions, however setup been run in meantime has several changes ignoring those would cause all procedure to crash due to changes in Fedora 20 happened since 11/2013. All F20 updates have happened sinse 01/23 where applied to each one of working clusters.

"Setting up Two Physical-Node OpenStack RDO Havana + Neutron GRE + Gluster backend for Cinder" on Fedora 20 boxes with both Controller and Compute nodes each one having one Ethernet adapter .

Core idea of setup you are interested in had been provided by http://kashyapc.com/2013/11/
However, there is some distance from POC to production running,if you
would like you may go through stuff described in my answer. It would
give you a snapshot of 3 months development in step by step details.
I am very sorry, but having ready for production , stable running
"Two Nodes F20 Clusters Neutron&GRE with only one Ehernet adapter for each node"
go back to CentOS 6.5 doesn't seem to me as a good idea. I sincerely apologize
for first redaction of my feedback

Unfortunatelly it's too hard to analyze  mistakes been done in your setup.
 I can provide a link based on updated  setup for Two  Fedora 20 VMs running on non-default libvirt subnet    suggested by  Kashyap Chamarthy in November 2013. Setup down here is for Two  Node Fedora 20 physical boxes with  native Havana packages installed.  I have in meantime several  Two Node Clusters been built as descibed bellow running on daily basis in QA environment for about 2.5  months. So, I am quite sure that provided HowTo is correct. Have to mention that there is no any answer file, every setup has been done manually following ,in general, original Kashyap's instructions, however setup been supposed to run in meantime has several important changes ignoring those would cause all procedure to crash due to changes in Fedora 20 happened since 11/2013. All F20 updates have happened sinse 01/23 where applied to each one of working clusters.

"Setting up Two Physical-Node OpenStack RDO Havana + Neutron GRE + Gluster backend for Cinder" on Fedora 20 boxes with both Controller and Compute nodes each one having one Ethernet adapter .