To run:
heat stack-create -f openstack_multi_node.yml openstack-multi -P "key_name=<keyname>;os_ansible_git_version=<branch/tag>" -t 150
(Replace <keyname>
with your nova key and <branch/tag>
with the desired os-ansible version to deploy)
Failing to specify -t 150
will result in the stack-create timing out and failing as a result.