As a first step to upgrade to a nova-less undercloud, the baremetal
deployment yaml which represents the current overcloud needs to be
built.
This command builds the yaml for an existing overcloud using the
heat stack output AnsibleHostVarsMap and a list of all baremetal
nodes. When the generated yaml is used to run "openstack overcloud
node provision" no changes will be made to any nodes.
Blueprint: nova-less-deploy
Change-Id: I47c885697bf36b999fd0ad9bd99a23990440ed62