First cut at adding HP load balancer (still beta) to bang. Adds a consul
that looks up existing by name and can create a new one. Consul includes
functionality to match exist nodes to those required.
Adds empty security group per load balancer and assigns to related servers
Add deployer to create load balancer security group rulesets after load balancers are provisioned by adding an extra deployer that reads its rules from the stack after the LB deployers finish