Add groups-dev.openstack.org node

Add a groups-dev node to openstack infra, based on drupal
environment. This node checks out the repository:
https://git.openstack.org/openstack-infra/groups

Build a new deployment from scratch, including drush make
distbuild and drush si auto-installation features.

Change-Id: I71eef1c14724ceb13a896ff768923148dedcc2ef