'depends_on' field in docker-compose.yml file is not honored when used with 'docker-compose bundle' to create '.dab' file.

[Saravana9210]

Description
'depends_on' field in docker-compose.yml file is not honored when used with 'docker-compose bundle' to create docker bundle (.dab file).

Steps to reproduce the issue:

1. Define 3 services in docker-compose.yml with service2 and service3 depends on service1 (using depends_on field)
2. Go to the directory where you have the docker-compose.yml file.
3. Create docker bundle using 'docker-compose bundle' command (this will create a docker.dab file)
4. Deploy the bundle using 'docker deploy docker' command

Describe the results you received:

1. All 3 services are started
2. But, order of starting services is random ('depends_on' field is not considered)

Describe the results you expected:

1. service1 should be stared first

Additional information you deem important (e.g. issue happens only occasionally):
Also, pls throw some light on service registry, service discovery and communication among services. Thanks in advance !!!

Output of docker version:

(paste your output here)

Output of docker info:

(paste your output here)

Additional environment details (AWS, VirtualBox, physical, etc.):
I've 3 VMs with docker 1.12.1 installed

VM1 - swarm master
VM2 - Node1
VM3 - Node2

[thaJeztah]

The depends_on option is currently not supported in the compose v3 format (a discussion on this can be found in #31333), and the .dab format was experimental (and is now removed), so I'm closing this issue