Stop docker-compose errors when removing services
Stop docker-compose errors when removing services

When removing a service (e.g. service A) from the environment
configuration, `navy refresh-config` would fail because we were calling
`docker-compose up` with a list of service names, including service A.

This change makes navy check the list of service names it's trying to
launch, and filters out any that it doesn't know about.

momentumft/navy,momentumft/navy,momentumft/navy