Decouple proxy node to backend nodes deployment

Issue description:

Every new deployment of OOD backend needs a redeploy of http-proxy because with the internal IP changes for every new deployment. The proxy should know the internal IP for it to route traffic to the backend. We need to find a way to decouple this dependency during deployments.

Proposed Solution:

The immediate fix is to

• Deploy the backends with a fixed internal IP.

The long-term solution is to

1. Create a DNS service internal to Openstack.
2. Create a DNS entry with hostname/IP mapping in the internal DNS and use a DNS Name instead of an IP.