Revert in part a9c9a595168a2efd41732778bf5f605ac8590813

Since https://github.com/enovance/openstack-yaml-infra-3nodes-fullha/commit/5c22d03b67f847f7e34a64ad56cfc2256961f0c7 was more recent than https://github.com/enovance/openstack-serverspec/commit/a9c9a595168a2efd41732778bf5f605ac8590813 I took for granted that the former was the right one. This commit might need to be reverted if it is supposed to be the other way around.