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You wrote "The odd thing is I see the router port for the internal network as DOWN."
Yes, it is. Your neutron router doesn't forward packets from tenant's network to external.
I would try recreate sub-net && router. Either try stable kilo or juno branches, they worked fine for me. See http://bderzhavets.blogspot.com/2015/04/setup-nova-docker-driver-openstack-kilo.html
(just skip all nova-docker related content)
and https://ask.openstack.org/en/question/64574/cloning-from-openstack-devdevstack-yields-c-api-and-other-installation-failures/