Nested HOT template to deploy HA OpenShift environment

Template deploys HA set of OpenShift brokers (3), 3 nodes, Load Balancer
as a Service (LBaaS), floating IPs for all instances (including LBaaS VIP).
It also deploys Cinder attached storage for node failover and recovery.
Dynamic DNS is configured on broker1 and all OpenShift services are
configured.

Change-Id: If6d81988d47b70b995c5fc9cc308d36d5ae5bb1e