Build containers with Packer instead

With Dockerfiles, OVS had to build when the container was first run.
It's faster to compile OVS when the contaoner is built, but
Dockerfiles won't let this be done programatically. Packer does.

Dockerfile is now deprecated.

Add build-containers to build and upload all containers to docker index
Update README.md
Update install scripts and remove intial OVS configuration
Add docker-ovs.json for Packer
Add supervisord.conf to allow supervisor to manage OVS processes