* docker swarm does not respect depends_on
Swarmkit does not seem to have the concept of starting services in a particular order.
Tested with docker 1.13.1. Also, `docker-compose bundle` warns us about depends_on being unsupported.
* Remove condition form of depends_on from the V3 compose file docs.
Signed-off-by: Daniel Nephin <dnephin@gmail.com>