Updates the Shipyard/Airflow workflow for deploy_site and
update_site to use the deployment group/deployment strategy
information from the design.
This allows for baremetal nodes to be deployed in a design-
specified order, with criticality and success criteria driving
the success and failure of deployment.
Includes refactoring of service endpoints to reduce the need
for so much data passing.
Change-Id: Ib5e9fca535ca74d1819fe46959695acfed5b65c2
04906cce68