Update Compose files to 2.0 format

[misterbisson]

#9 demonstrated Docker Compose format 2.0 for compatibility with Docker Swarm, but #14 made changes that conflict with #9.

New plan:

• Update docker-compose.yml and local-compose.yml to the 2.0 format
• local-compose.yml extends docker-compose.yml
• Use network_mode: bridge in docker-compose.yml

docker-compose.yml will work on Triton, local-compose.yml will work in local Docker and Swarm environments. After the completion of https://smartos.org/bugview/DOCKER-723 and related tickets, we can drop network_mode: bridge from docker-compose.yml.

[tianon]

Sounds like a sane plan! 👍

[tgross]

This will be covered in #79 because I needed it for #51 and getting the builds running on Jenkins.

[tgross]

Merged in #79. Will be in the next release (which will be to fix #71)

[tgross]

Released in https://github.com/autopilotpattern/mysql/releases/tag/5.6r3.1.2