As can be seen in build/creating_data/create-rhel-repo.sh particular release of docker-ce package is installed on target platform while in molecule test latest release is installed. For uniformity same version should be deployed in testing env.

More thorough discussion on this topic can be found here: https://gerrit.onap.org/r/c/83227/11/ansible/test/roles/prepare-docker/tasks/main.yml