Version 2.2
- Removed the upgrade fixes added in Version 2.1.
- No longer pass the "--force-confnew" flag to apt when installing the Docker package.
This flag, added in 2.1.2, turned out to have some undesirable side effects. - Role now manages the "/etc/default/docker" file. The config variable "docker_daemon_flags"
controls what is passed to DOCKER_OPTS in that file.