Docker compose will fail with a version error if docker-py
is not 1.2.3.  Using >= 1.2.0 will get docker-py 1.3.0 causing
compose to fail.

Change-Id: I54ba1fe95b9c7a5a242b8339e153fbee80ff6c3b
Closes-Bug: #1473856

This new build script is written entirely in python and supports
multithreading to speed up the builds.

Partially-Implements: blueprint build-script
Change-Id: Ia630e5a83951ec37706a9596427024f3b7c10ba7

docker-compose should be pinned for safety.

Change-Id: I26c19f4a8fe446f77074d8bf49795808f48531cc
Partial-Bug: #1468999

This adds functional tests to tox, along with a number of prerequisite
steps. Since this is primarily a bash project, pbr usage has been avoided.
Tests are to be written in python and put in the tests directory.

Running tox -e setupenv will execute a setup script
(tests/setup_docker.sh) to ensure the running instance of docker meets
the minimum version requirement.

Running tox -e images will execute the image building script
(tools/build-all-docker-images) and will parse the resulting output to report
failures.

Running tox -e startenv will generate the environment file, run
"tools/kolla start", and run first time initialization (eventually).

Running tox -e functional is for actually testing the deployed OpenStack
environment via a series of tests utilizing the client APIs.

Change-Id: Iff6dfdca43f0c44d471e7540a7836e56a0de4507