Note: I don't really know Python. I hacked my way around, so I apologize if anything just looks plain dumb.
- You can now indicate your Service(s) to be load balanced ("SERVICES" Environment Variable on HAProxy)
- Note: Services env var only only apply to services within the same project/namespace.
- Format is: <ServiceName>:<Port>,<Port>;<ServiceName>...
 - Ex: SERVICES=nginxapp1:443,8080;nginxapp2:80,nginxapp3
- If any services are specified, HAProxy will only pay attention to the defined services in this variable. 
 - Compose: must Link the service to the HAProxy
- If any ports are specified, they will be the only ports used for that service. 
 - Note: If no ports are specified:
 - Swarm: it will check the Service for the Env Var "SERVICE_PORTS" (original behavior)
 - Compose: it will add all exposed ports (original behavior)
- If a specified service is not on the same network as HAProxy, it will be ignored (original behavior)