[epic milestone] Switching to provider's API rather than direct command line.

[cdrage]

So we're changing Openshift from running the command to communicating to the API #321.

We are also adding Mesos that's also talking via the API #392

We should do the same with Docker as well as Kubernetes. Sure, it'll add a lot more dependencies, but this gives us a lot more freedom for manipulation as well as error-checking / testing.

[aweiteka]

+1

[rtnpro]

:+1: @charliedrage, as I had already worked with docker-py in the past, I will start with migrating the docker provider to use docker API.

[dustymabe]

• [x] openshift #321
• [x] mesos #392
• [ ] docker #445
• [ ] kubernetes #446