[WIP] Build images with ansible-container.

[mbarnes]

Add necessary YAML files to let ansible-container build service-specific container images. Promises to be easier than maintaining and building a suite of per-service Dockerfiles.

Related to projectatomic/commissaire#129

[mbarnes]

I think this is getting close. I organized the Ansible roles similar to how the source code is organized: a base service role common to all services, and a dedicated role for each service (storage, investigator, clusterexec, etc.). That keeps the container.yml file fairly clean.

I was trying to fine-tune the dependencies for each service, and ended up hacking our own setup a bit because we only have one requirements.txt shared for all services. I didn't want, for example, Ansible being installed for the commissaire-storage-service image, which doesn't use Ansible. So for each image I override the requires.txt file in the package's "egg-info" directory with a unique file tailored to that service.

Next step is figuring out how to integrate config files into all this.

[mbarnes]

(5) [multi-host-mgr-2] Containerize individual Commissaire services

[mbarnes]

Related: projectatomic/commissaire#135