Docker install script fails to install docker registry

The tools/docker/install_docker.sh script fails during the
installation/setup of the docker registry.
The problem is that the used environment variables are wrong.

REGISTRY_IMAGE > DOCKER_REGISTRY_IMAGE
REGISTRY_IMAGE_NAME > DOCKER_REGISTRY_IMAGE_NAME

Change-Id: I16f051abe5c426f295c69d518b49c1b9a7b4cc94
Add marconi to enabled services

This patch adds marconi to enabled services. This is needed to run
the tempest experimental job for marconi.

Change-Id: I28794c3acacc6daa9f698f8031b58d1ee13c3bad
Implements: blueprint add-basic-marconi-tests
Update docker driver to use a CirrOS image

For purposes of matching the VM image used
in devstack across hypervisors, set the
default container image for Docker to cirros.

This uses the CirrOS image from stackbrew,
the "standard library" for Docker.

Change-Id: I9d767a4e06c5caa7b92ffea25e6a9aeda9bf282a
Replace custom cinder driver configs

The devstack/lib/cinder file has a number of third party
driver config options hard-coded in it.  Rather than add
yet another if driver== statement here let's use plugin
files and do something similar to what's already
in place for nova_hypervisors and neutron plugins.

This works the same way folks were implementing their
drivers already, the key is to use a CINDER_DRIVER
variable in your localrc file that matches the name
of the lib/cinder_plugin file to use.

The existing third party driver entries that were
in lib/cinder have been migrated to cooresponding
plugin files.

Change-Id: I4ee51ea542d5aa63879afd5297311a9df727c57f
Fix bug "Invalid OpenStack Nova credentials." on the gate

During the process, when create_userrc.sh tries to creates
certificates and sourcable rc, it assumes that all users have
the same password.

Change-Id: Ifb57a43aad439ffe041e98465719a8a8eceae544
Closes-Bug: #1260723
Merge "Update docker driver to use a CirrOS image"
Merge "Add marconi to enabled services"
Merge "Replace custom cinder driver configs"
Merge "Docker install script fails to install docker registry"
Merge "Fix bug "Invalid OpenStack Nova credentials." on the gate"