* docker_login: fix internal config file storage to handle credentials for more than one registry
* Improve setup for docker registry.
* Add second registry frontend. Add tests for #1118.
* Fix cleanup.
* Don't die when docker CLI doesn't want to work with docker daemon.
* Allow more 'docker volume ls' failures
* More.
* Fix more failures.
* Forgot ignore_errors.
* Another one.
* More places.
* Try to install newer docker on RHEL8.
* Also restrict docker-ce-cli.