This patch contains only a new Dockerfile and few changes to
be able to build both py2 and py3 images.
Next patch should contain changes to add the gate jobs to build
a py3 docker image
Added Dockerfile and configuration files under the
new `docker` directory to build a Swift All in One container
The primary goal of this container image is to provide
application developers with a Swift/S3 endpoint that can be
tested against during the development cycle.
Added Zuul jobs to build docker container