ffu: Add fast-forward-upgrade env
ffu: Add fast-forward-upgrade env

This change introduces a simple environment file to be used when
updating the inital overcloud stack to generate the required Ansible
outputs. This environment introduces the following:

- resource_registry entries to ensure compatability between the deployed
  Newton stack and the new Queens stack. These services having been
  previously deprecated in Ocata before removal in Pike.
- parameter_defaults for StackUpdateType and UpgradeRemoveUnusedPackages

bp fast-forward-upgrades
Change-Id: I3c690b8d08ca3a7d75481e176760a0efddebf82a

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates